# Math | Mathematics homework help

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

Solve the collection.

1)  A stray scantling of  700 proud nurture seniors is consecrated the SAT-V touchstone. The moderation reckoning for this scantling is  overbar(x) = 487. What can you say environing the moderation reckoning m of all proud nurture seniors? 1)  ______________

2)  The gradation top moderations for 10 strayly chosen tyros in a statistics collocate delay 125 tyros are listed under. What can you say environing the moderation reckoning m of all 125 tyros?

3.7     2.5     2.3     2.0     2.6     3.5     2.1     2.8     2.4     3.6 2)  ______________

3)  A positive trust in cessation is  8.35 < m <  9.85. Find the scantling moderation  overbar(x) and the untruth of like E. 3)  ______________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

4)  Given the identical scantling statistics, which smooth of trust earn fruit the narrowest trust cessation? 4)  ________

A) 75% B)  85% C)  90% D)  95%

5)  The gradation top moderations for 10 strayly chosen tyros in a statistics collocate delay 125 tyros are listed under.

2.0    3.2    1.8    2.9    0.9    4.0    3.3    2.9    3.6    0.8

What is the consequence on the width of the trust cessation if the scantling extent is increased to 20? 5)  ________

A) The width decreases.

B) The width increases.

C) The width dregs the identical.

D) It is impracticable to mention delayout past counsel.

6)  Find the nice venerate  _elementsubscript_element that corresponds to a  94% trust smooth. 6)  ________

A)  plusminus1.88 B)   plusminus1.645 C)   plusminus1.96 D)   plusminus2.33

7)  Determine the untruth of like if the gradation top moderations for 10 strayly chosen tyros from a collocate of 125 tyros has a moderation of  overbar(x) =  2.0. Assume the gradation top moderation of the 125 tyros has a moderation of m =  2.5. 7)  ________

A)  0.5 B)   2.25 C)  - 0.5 D)   1.75

8)  A stray scantling of  50 tyros has a touchstone reckoning moderation delay a flag rupture of  11.4. Find the completion untruth of like if c =  0.98. 8)  ________

A)  3.76 B)   0.53 C)   1.61 D)   1.58

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

9)  In a late con-over of  71 eighth gradationrs, the moderation enumerate of hours per week that they watched television was  18.7 delay a flag rupture of  5.8 hours.

a) Find the  98% trust cessation of the moderation.

b) If the flag rupture is doubled to  11.6, what earn be the consequence on the trust cessation? 9)  ______________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

10)  A stray scantling of 150 tyros has a gradation top moderation delay a moderation of 2.86 and delay a flag rupture of 0.78. Invent the trust cessation for the population moderation, m, if c = 0.98. 10)  _______

A) (2.71, 3.01) B)  (2.51, 3.53) C)  (2.43, 3.79) D)  (2.31, 3.88)

11)  A stray scantling of 40 tyros has a touchstone reckoning delay  overbar(x) = 81.5 and s = 10.2. Invent the trust cessation for the population moderation, m if c = 0.90. 11)  _______

A) (78.8, 84.2) B)  (51.8, 92.3) C)  (66.3, 89.1) D)  (71.8, 93.5)

12)  A stray scantling of 40 tyros has a moderation annual rights of \$3120 and a flag rupture of \$677. Invent the trust cessation for the population moderation, m if c = 0.95. 12)  _______

A) (\$2910, \$3330) B)  (\$210, \$110)

C) (\$4812, \$5342) D)  (\$1987, \$2346)

13)  A stray scantling of 56 fluorescent characterless bulbs has a moderation personality of 645 hours delay a flag rupture of 31 hours. Invent a 95% trust cessation for the population moderation. 13)  _______

A) (636.9, 653.1) B)  (539.6, 551.2)

C) (112.0, 118.9) D)  (712.0, 768.0)

14)  A collocation of 49 strayly chosen tyros has a moderation age of 22.4 years delay a flag rupture of 3.8. Invent a 98% trust cessation for the population moderation. 14)  _______

A) (21.1, 23.7) B)  (20.3, 24.5) C)  (19.8, 25.1) D)  (18.8, 26.3)

15)  A collocation of 40 bowlers showed that their moderation reckoning was 192 delay a flag rupture of 8. Find the 95% trust cessation of the moderation reckoning of all bowlers. 15)  _______

A) (189.5, 194.5) B)  (186.5, 197.5)

C) (188.5, 195.6) D)  (187.3, 196.1)

16)  In a stray scantling of 60 computers, the moderation mend consume was \$150 delay a flag rupture of \$36. Invent a 99% trust cessation for the population moderation. 16)  _______

A) (\$138, \$162) B)   (\$18, \$54) C)  (\$238, \$274) D)  (\$537, \$654)

17)  In a late con-over of 42 eighth gradationrs, the moderation enumerate of hours per week that they watched television was 19.6 delay a flag rupture of 5.8 hours. Find the 98% trust cessation for the population moderation. 17)  _______

A) (17.5, 21.7) B)  (14.1, 23.2) C)  (18.3, 20.9) D)  (19.1, 20.4)

18)  In a scantling of 10 strayly chosen women, it was set-up that their moderation altitude was 63.4 inches. From former studies, it is antecedent that the flag rupture, s, is 2.4. Invent the 95% trust cessation for the population moderation. 18)  _______

A) (61.9, 64.9) B)  (58.1, 67.3) C)  (59.7, 66.5) D)  (60.8, 65.4)

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

19)  There were 800 math instructors at a mathematics conference. Forty instructors were strayly chosen and consecrated an IQ touchstone. The reckonings fruitd a moderation of 130 delay a flag rupture of 10. Find a 95% trust cessation for the moderation of the 800 instructors. Use the restricted population discipline factor. 19)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

20)  The flag IQ touchstone has a moderation of  97 and a flag rupture of  18. We neglect to be  95% positive that we are delayin  5 IQ tops of the gentleman moderation. Individualize the required scantling extent. 20)  _______

A)  50 B)   8 C)   147 D)   1

21)  A encourage at a persomal hospital is animated in estimating the family heaviness of infants. How wide a scantling must she fine if she desires to be  99% impudent that the gentleman moderation is delayin  3 ounces of the scantling moderation? The flag rupture of the family heavinesss is notorious to be  8 ounces. 21)  _______

A)  48 B)   47 C)   7 D)   6

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

22)  In classify to set rates, an prophylactic union is reserved to like the enumerate of weak days that unmeasured season workers at an auto mend fund catch per year. A former con-over indicated that the flag rupture was  2.2 days. a) How wide a scantling must be chosen if the union neglects to be  95% impudent that the gentleman moderation disputes from the scantling moderation by no past than 1 day? b) Repeat bisect (a) using a  98% trust cessation. Which smooth of trust requires a wider scantling extent? Explain. 22)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

23)  Find the nice venerate,  _elementsubscript_element for c = 0.99 and n = 10. 23)  _______

A) 3.250 B)  2.2821 C)  2.262 D)  1.833

24)  Find the nice venerate,  _elementsubscript_element, for c = 0.95 and n = 16. 24)  _______

A) 2.131 B)  1.753 C)  2.602 D)  2.947

25)  Find the nice venerate,  _elementsubscript_element, for c = 0.90 and n = 15. 25)  _______

A) 1.761 B)  1.345 C)  2.145 D)  2.624

26)  Find the venerate of E, the completion untruth of like, for c = 0. 90, n = 16 and s =  2.3. 26)  _______

A)  1.01 B)   0.25 C)   0.77 D)   0.19

27)  Find the venerate of E, the completion untruth of like, for c = 0. 99, n = 10 and s =  3.8. 27)  _______

A)  3.91 B)   3.39 C)   1.23 D)   3.81

28)  Find the venerate of E, the completion untruth of like, for c = 0. 99, n = 15 and s =  5.1. 28)  _______

A)  3.92 B)   4.02 C)   3.46 D)   1.01

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

29)  Construct a 98% trust cessation for the population moderation, m. Assume the population has a natural disposal. A stray scantling of 20 seed-plot tyros has moderation annual rights of  \$3480 delay a flag rupture of  \$668. 29)  _____________

30)  Construct a 95% trust cessation for the population moderation, m. Assume the population has a natural disposal. In a stray scantling of 26 computers, the moderation mend consume was  \$160 delay a flag rupture of  \$34. 30)  _____________

31)  a) Invent a 95% trust cessation for the population moderation, m. Assume the population has a natural disposal. In a stray scantling of 26 computers, the moderation mend consume was  \$174 delay a flag rupture of  \$37.

b) Suppose you did some lore on mend consumes for computers and set-up that the flag rupture is  sigma = 37. Use the natural disposal to invent a 95% trust cessation for the population moderation, m. Compare the results. 31)  _____________

32)  A creator receives an classify for fluorescent characterless bulbs. The classify requires that the bulbs keep a moderation personality brace of  850 hours. The creator fines a stray scantling of 25 fluorescent characterless bulbs and finds that they keep a moderation personality brace of  845 hours delay a flag rupture of 15 hours. Touchstone to see if the creator is making cheerful characterless bulbs. Use a 95% trust smooth. Assume the axioms are naturally reserved. 32)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

33)  Construct a 95% trust cessation for the population moderation, m. Assume the population has a natural disposal. A scantling of 20 seed-plot tyros had moderation annual rights of \$3120 delay a flag rupture of \$677. 33)  _______

A) (\$2803, \$3437) B)  (\$1324, \$1567)

C) (\$2135, \$2567) D)  (\$2657, \$2891)

34)  Construct a 90% trust cessation for the population moderation, m. Assume the population has a natural disposal. A scantling of 15 strayly chosen tyros has a gradation top moderation of 2.86 delay a flag rupture of 0.78. 34)  _______

A) (2.51, 3.21) B)  (2.41, 3.42) C)  (2.37, 3.56) D)  (2.28, 3.66)

35)  Construct a 95% trust cessation for the population moderation, m. Assume the population has a natural disposal. A scantling of 25 strayly chosen tyros has a moderation touchstone reckoning of 81.5 delay a flag rupture of 10.2. 35)  _______

A) (77.29, 85.71) B)  (56.12, 78.34)

C) (66.35, 69.89) D)  (87.12, 98.32)

36)  Construct a 95% trust cessation for the population moderation, m. Assume the population has a natural disposal. A stray scantling of 16 fluorescent characterless bulbs has a moderation personality of 645 hours delay a flag rupture of 31 hours. 36)  _______

A) (628.5, 661.5) B)  (876.2, 981.5)

C) (531.2, 612.9) D)  (321.7, 365.8)

37)  Construct a 99% trust cessation for the population moderation, m. Assume the population has a natural disposal. A collocation of 19 strayly chosen tyros has a moderation age of 22.4 years delay a flag rupture of 3.8 years. 37)  _______

A) (19.9, 24.9) B)  (16.3, 26.9) C)  (17.2, 23.6) D)  (18.7, 24.1)

38)  Construct a 98% trust cessation for the population moderation, m. Assume the population has a natural disposal. A con-over of 14 bowlers showed that their moderation reckoning was 192 delay a flag rupture of 8. 38)  _______

A) (186.3, 197.7) B)  (222.3, 256.1)

C) (328.3, 386.9) D)  (115.4, 158.8)

39)  Construct a 90% trust cessation for the population moderation, m. Assume the population has a natural disposal. In a late con-over of 22 eighth gradationrs, the moderation enumerate of hours per week that they watched television was 19.6 delay a flag rupture of 5.8 hours. 39)  _______

A) (17.47, 21.73) B)  (18.63, 20.89)

C) (5.87, 7.98) D)  (19.62, 23.12)

40)  A stray scantling of 10 parking meters in a coast unity showed the subjoined incomes for a day. Assume the incomes are naturally reserved.

\$3.60  \$4.50  \$2.80  \$6.30  \$2.60  \$5.20  \$6.75  \$4.25  \$8.00  \$3.00

Find the 95% trust cessation for the gentleman moderation. 40)  _______

A) (\$3.39, \$6.01) B)  (\$2.11, \$5.34)

C) (\$4.81, \$6.31) D)  (\$1.35, \$2.85)

41)  The gradation top moderations for 10 strayly chosen proud nurture tyros are listed under. Assume the gradation top moderations are naturally reserved.

2.0   3.2   1.8   2.9   0.9   4.0   3.3   2.9   3.6   0.8

Find a 98% trust cessation for the gentleman moderation. 41)  _______

A) (1.55, 3.53) B)  (0.67, 1.81) C)  (2.12, 3.14) D)  (3.11, 4.35)

42)  A persomal bank needs counsel of the checking totality redresss of its customers. A stray scantling of 15 totalitys was checked. The moderation redress was \$686.75 delay a flag rupture of \$256.20. Find a 98% trust cessation for the gentleman moderation. Assume that the totality redresss are naturally reserved. 42)  _______

A) (\$513.17, \$860.33) B)  (\$238.23, \$326.41)

C) (\$326.21, \$437.90) D)  (\$487.31, \$563.80)

43)  When  475 seed-plot tyros were reconnoitreed, 125 said they own their car. Find a top like for p, the population distribution of tyros who own their cars. 43)  _______

A)  0.263 B)   0.737 C)   0.357 D)   0.208

44)  A reconnoitre of 100 destructive accidents showed that  11 were alcohol akin. Find a top like for p, the population distribution of accidents that were alcohol akin. 44)  _______

A)  0.11 B)   0.89 C)   0.124 D)   0.099

45)  A reconnoitre of  500 non-destructive accidents showed that  118 confused the use of a cell phone. Find a top like for p, the population distribution of accidents that confused the use of a cell phone. 45)  _______

A)  0.236 B)   0.764 C)   0.309 D)   0.191

46)  A reconnoitre of 250 households showed  37 owned at smallest one gun. Find a top like for p, the population distribution of households that own at smallest one gun. 46)  _______

A)  0.148 B)   0.852 C)   0.174 D)   0.129

47)  A reconnoitre of  2490 golfers showed that  347 of them are left-handed. Find a top like for p, the population distribution of golfers that are left-handed. 47)  _______

A)  0.139 B)   0.861 C)   0.162 D)   0.122

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

48)  When  385 seed-plot tyros were reconnoitreed,  160 said they own their car. Invent a 95% trust cessation for the distribution of seed-plot tyros who say they own their cars. 48)  _____________

49)  A reconnoitre of  600 non-destructive accidents showed that  166 confused the use of a cell phone. Invent a 99% trust cessation for the distribution of destructive accidents that confused the use of a cell phone. 49)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

50)  A reconnoitre of 100 destructive accidents showed that 52 were alcohol akin. Invent a 98% trust cessation for the distribution of destructive accidents that were alcohol akin. 50)  _______

A) (0.404, 0.636) B)  (0.120, 0.340)

C) (0.560, 0.580) D)  (0.880, 0.900)

51)  A reconnoitre of 250 households showed 62 owned at smallest one gun. Invent a 90% trust cessation for the distribution of households that own at smallest one gun. 51)  _______

A) (0.203, 0.293) B)  (0.103, 0.189)

C) (0.369, 0.451) D)  (0.683, 0.712)

52)  A reconnoitre of 2450 golfers showed that 281 of them are left-handed. Invent a 98% trust cessation for the distribution of golfers that are left-handed. 52)  _______

A) (0.100, 0.130) B)  (0.203, 0.293)

C) (0.369, 0.451) D)  (0.683, 0.712)

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

53)  In a reconnoitre of 10 golfers, 2 were set-up to be left-handed. Is it trained to invent the 90% trust cessation for the population distribution, p? Explain.

53)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

54)  A loreer at a important hospital wishes to like the distribution of the adult population of the United States that has proud blood hurry. How wide a scantling is needed in classify to be  98% impudent that the scantling distribution earn not dispute from the gentleman distribution by past than  6%? 54)  _______

A)  378 B)   10 C)   755 D)   267

55)  A pollster wishes to like the distribution of United States voters who benefit consummate pain. How wide a scantling is needed in classify to be  90% impudent that the scantling distribution earn not dispute from the gentleman distribution by past than  4%? 55)  _______

A)  423 B)   256 C)   11 D)   846

56)  A special notion poll is conducted for a politician to individualize what distribution of the population benefits decriminalizing marijuana tenure. How wide a scantling is needed in classify to be  95% impudent that the scantling distribution earn not dispute from the gentleman distribution by past than  3%? 56)  _______

A)  1068 B)   752 C)   2135 D)   17

57)  A creator of golf equipment wishes to like the enumerate of left-handed golfers. How wide a scantling is needed in classify to be  99% impudent that the scantling distribution earn not dispute from the gentleman distribution by past than  6%? A former con-over indicates that the distribution of left-handed golfers is  10%. 57)  _______

A)  166 B)   136 C)   185 D)   38

58)  A loreer wishes to like the enumerate of households delay two cars. How wide a scantling is needed in classify to be  95% impudent that the scantling distribution earn not dispute from the gentleman distribution by past than  5%? A former con-over indicates that the distribution of households delay two cars is  24%. 58)  _______

A)  281 B)   198 C)   369 D)   4

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

59)  A propound proudway sentry administrative wishes to like the enumerate of drivers that exceed the expedite condition traveling a positive pathway.

a) How wide a scantling is needed in classify to be  90% impudent that the scantling distribution earn not dispute from the gentleman distribution by past than  2%?

b) Repeat bisect (a) magnificent former studies set-up that  85% of drivers on this pathway exceeded the expedite condition. 59)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

60)  Find the nice venerates,  X delay (superscript (stacked) and subscript (~%3)) and X delay (superscript (stacked) and subscript (~%3)), for c = 0.95 and n = 12.    60)  _______

A) 3.816 and 21.920 B)  3.053 and 24.725

C) 4.575 and 26.757 D)  2.603 and 19.675

61)  Find the nice venerates,  X delay (superscript (stacked) and subscript (~%3)) and X delay (superscript (stacked) and subscript (~%3)), for c = 0.90 and n = 15. 61)  _______

A) 6.571 and 23.685 B)  4.075 and 31.319

C) 4.660 and 29.131 D)  5.629 and 26.119

62)  Find the nice venerates,  X delay (superscript (stacked) and subscript (~%3)) and X delay (superscript (stacked) and subscript (~%3)), for c = 0.98 and n = 20. 62)  _______

A) 7.633 and 36.191 B)  6.844 and 27.204

C) 8.907 and 38.582 D)  10.117 and 32.852

63)  Find the nice venerates,  X delay (superscript (stacked) and subscript (~%3)) and X delay (superscript (stacked) and subscript (~%3)), for c = 0.99 and n = 10. 63)  _______

A) 1.735 and 23.587 B)  2.156 and 25.188

C) 2.088 and 21.666 D)  2.558 and 23.209

64)  Construct a 95% trust cessation for the population flag rupture s of a stray scantling of 15 men who keep a moderation heaviness of 165.2 pounds delay a flag rupture of  12.4 pounds. Assume the population is naturally reserved. 64)  _______

A) ( 9.1,  19.6) B)  ( 82.4,  382.4) C)  ( 2.6,  5.6) D)  ( 9.5,  18.1)

65)  Assume that the altitudes of men are naturally reserved. A stray scantling of 16 men keep a moderation altitude of 67.5 inches and a flag rupture of  2.6 inches. Invent a 99% trust cessation for the population flag rupture, s. 65)  _______

A) ( 1.8,  4.7) B)  ( 1.8,  4.8) C)  ( 1.1,  2.9) D)  ( 1.8,  4.4)

66)  Assume that the altitudes of women are naturally reserved. A stray scantling of 20 women keep a moderation altitude of 62.5 inches and a flag rupture of  1.4 inches. Invent a 98% trust cessation for the population antagonism,  sigma to sway of (2). 66)  _______

A) ( 1.0,  4.9) B)  ( 1.0,  2.2) C)  ( 0.7,  3.5) D)  ( 1.1,  5.1)

67)  The moderation renovation season for a stray scantling of 12 microwave ovens is 8.6 years delay a flag rupture of  2.7 years. Invent the 98% trust cessation for the population antagonism,  sigma to sway of (2). Assume the axioms are naturally reserved 67)  _______

A) ( 3.2,  26.3) B)  ( 1.8,  5.1) C)  ( 1.2,  9.7) D)  ( 3.1,  22.5)

68)  A tyro strayly fines 10 CDs at a hoard. The moderation is \$8.75 delay a flag rupture of \$1.50. Invent a 95% trust cessation for the population flag rupture, s. Assume the axioms are naturally reserved. 68)  _______

A) (\$1.03, \$2.74) B)  (\$0.43, \$1.32)

C) (\$1.43, \$2.70) D)  (\$1.76, \$3.10)

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

69)  The altitudes (in inches) of 20 strayly chosen adult males are listed under. Invent a 99% trust cessation for the antagonism,  sigma to sway of (2). Assume the population is naturally reserved.

70    72    71    70    69    73    69    68    70    71

67    71    70    74    69    68    71    71    71    72 69)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the proposition or answers the inquiry.

70)  The gradation top moderations for 10 strayly chosen tyros are listed under. Invent a 90% trust cessation for the population flag rupture, s. Assume the axioms are naturally reserved.

2.0    3.2    1.8    2.9    0.9    4.0    3.3    2.9    3.6    0.8 70)  _______

A) (0.81, 1.83) B)  (0.32, 0.85) C)  (0.53, 1.01) D)  (1.10, 2.01)

SHORT ANSWER.  Write the signal or peculiarity that best completes each proposition or answers the inquiry.

71)  A compriseer of car oil is reckoned to comprise 1000 milliliters of oil. A temper curb director neglects to be positive that the flag rupture of the oil compriseers is less than 20 milliliters. He strayly fines 10 cans of oil delay a moderation of 997 milliliters and a flag rupture of 32 milliliters. Use these scantling results to invent a 95% trust cessation for the gentleman venerate of s. Does this trust cessation recommend that the abnormity in the oil compriseers is at an cheerful smooth? 71)  _____________