Quiz 9 in Math 243: Statistical Analysis of Memory Improvement and Hypothesis Testing, Quizzes of Probability and Statistics

Download Quiz 9 in Math 243: Statistical Analysis of Memory Improvement and Hypothesis Testing and more Quizzes Probability and Statistics in PDF only on Docsity! Quiz 9 Name Math 243 GTF June 5, 2009 Disc. Time 1. Researchers want to determine if the newly discovered vitamin L can help improve memory. A simple random sample of 8 American adults is selected and they each take a memory exam. They adults are then given a dose of 500 ml of vitamin L each day for a month, and then given a similar exam at the end of the month. The results are given below. Do these scores provide evidence that vitamin L improves memory at a significance level α = 0.05? In your solution you should clearly indicate what type of test you are performing, your hypotheses, the test statistic, the P -value, and your conclusion. Subject Exam score before vitamin regimen Exam score after vitamin regimen 1 41 46 2 57 57 3 26 33 4 62 68 5 52 57 6 35 40 7 44 47 8 65 68 2. There is a serious flaw with the experimental design given in the previous problem, invalidating any conclusions we may have come up with. What is it? (a) Not enough subjects. (b) Waiting a month between exams invalidates the procedure. (c) The choice of α was too large. (d) Improper choice of sample. (e) The lack of a control group.