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STAT 200 QUIZ 3 Instructor: Jing Gao NAME___________________________________ Spring 2015 INSTRUCTIONS The quiz is worth 70 points total. The quiz...

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STAT 200 QUIZ 3 NAME ___________________________________ Instructor: Dr. Jing Gao Spring 2015 INSTRUCTIONS The quiz is worth 70 points total. The quiz covers week 6 materials. The quiz has two portions: Multiple Choice (8 problems, 32 points). Show work/explanation as appropriate . Short Answer (3 problems, 38 points) Show work . The quiz is open book and open notes . This means that you may refer to your textbook, notes, and online course materials, but you must work independently and may not consult anyone . You may take as much time as you wish, provided you turn in your quiz via LEO by 11:59 pm EDT on Sunday, March 1, 2015. With the quiz submission, please include the sentence, " I have completed this assignment myself, working independently and not consulting anyone except the instructor. MULTIPLE CHOICE . Choose the one alternative that best completes the statement or answers the question. 1. ( 4 points ) If the P-value of a hypothesis test comparing two means was 0.25, what can you conclude? (Select all that apply): A. You can accept the null hypothesis B. There was a significant difference between the means C. You failed to reject the null hypothesis D. There did not appear to be significant difference between the means 2. ( 4 points ) Imagine a researcher wanted to test the effect of the new drug on reducing blood pressure. In this study, there were 50 participants. The researcher measured the participants’ blood pressure before and after the drug intake. If we want to compare the mean blood pressure from the two time periods with a two-tailed t test, how many degrees of freedom are there? A. 49 B. 50 C. 99 D. 100
3. ( 4 points ) When sample size increases, ____ A. Power increases a great degree at first, reaches its peak, and then slowly decreases B. Power decreases a great degree at first, reaches its lowest point, and then slowly increases C. Power increases a great degree at first, and then increases slowly D. Power decreases a great degree at first, and then decreases slowly 4. ( 4 points ) α=0.05 for a two-tailed test. Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis. A. ±1.768 B. ±1.764 C. ±1.96 D. ±2.575 5. ( 4 points ) In a sample of 47 adults selected randomly from one town, it is found that 9 of them have been exposed to a particular strain of the flu. Find the P-value for a test of the claim that the proportion of all adults in the town that have been exposed to this strain of the flu is 8%. A. 0.0024 B. 0.0524 C. 0.0228 D. 0.0048
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