Phc 4069-Which Of The Following Statements Are True Regarding

Question 11 ptsWhich of the following statements are true regarding Type Iand Type II errors?Type II error occurs when we fail to reject a true nullhypothesis. Type II error occurs when we fail to reject a falsealternative hypothesis. Type-I error occurs when we reject a true nullhypothesisType-I error occurs when we reject a true alternativehypothesis. Question 21 ptsThe prevalence rate of Hypertension among US adults is30%. We plan to draw a random sample of 65 people fromthat population. What is the standard error of the sampleproportion of hypertension?0. 0570. 0750. 5700. 750Question 31 ptsWe selected a random sample of size 110 from a pool ofuniversity students and asked whether they use Facebook ona regular basis. Sixty replied yes. What would be yourestimation of the standard error of the sample proportion ofregular Facebook users based upon the given information?0. 0020. 0470. 0640. 247Question 41 ptsTo investigate the prevalence rate of Hypertension amongUS adults, we drew a random sample of 70 adults from theUS and among them 12 people had hypertension. Pleaseconstruct a 95% confidence interval for the populationproportion of hypertension. Which one of the followingresults is the closest to your answer? (Hint: use 1. 96 as thecritical z-value). [4. 3%, 29. 9%][6. 3%, 27. 9%][8. 3%, 25. 9%][10. 3%, 23. 9%]Question 51 ptsA random sample of size 110 was selected from a pool ofuniversity students and they were asked whether they useFacebook on a regular basis. Sixty replied yes. What wouldbe your 90% confidence interval estimate of the populationproportion of regular Facebook users based upon the giveninformation? (Hint: use 1. 65 as the critical z-value)[42. 6%, 66. 4%][44. 7%, 64. 4%][46. 7%, 62. 4%][48. 7%, 60. 4%]Question 61 ptsWhich of the following statements are correct regardingconfidence intervals and sample size?Confidence level has no impact on the size ofConfidence Intervals. Greater confidence requires narrower ConfidenceInterval. Greater confidence requires wider ConfidenceInterval. Smaller sample size gives narrower ConfidenceInterval. Question 71 ptsIt is known that the population standard deviation of the IQtest results is 16. Assuming that we have a random sampleof 140, what is the standard error of the average IQ of asample of this size?1. 351. 53416Question 81 ptsOne hundred and ninety undergraduate students wererandomly selected from a university that has 47,000students in total. Systolic blood pressure was tested on the190 students. The sample standard deviation is 11. 0 mmHg. What is the estimated standard error of the sample mean?0. 080. 801. 081. 80Question 91 ptsIt is known that the population standard deviation of the IQtest results is 16. Assuming that we have a random sampleof 155 and a sample mean of 94, what would be your 90%confidence interval estimate of the population mean? (Hint: use 1. 65 as the critical z-value)[87. 9, 100. 1][89. 9, 98. 1][91. 9, 96. 1][93. 9, 94. 1]Question 101 ptsTwo hundred undergraduate students were randomlyselected from a university that has 47,000 students in total. Systolic blood pressure was tested on the 200 students. Thesample mean is 118. 0 mmHg and the sample standarddeviation is 11. 0 mmHg. Please construct a 95% confidenceinterval for the population mean of students’ systolic bloodpressure. Which one of the following results is the closest toyour answer? (Hint: use 1. 96 as the critical z-value)[110. 5, 125. 5][112. 5, 123. 5][114. 5, 121. 5][116. 5, 119. 5]

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