9. A random sample of 135 people yielded the following contingency table describing the relationship between migraine headaches and caffeine consumption (low, medium, high). Caffeine Consumption Low Med. High Migraine 5 8 15 No Migraine 35 42 30 Suppose we wish to test H0 : caffeine and migraines are independent versus Ha : caffeine and migraines are not independent at the α = 0.05 significance level. What is the value of the test statistic and p−value?
9. A random sample of 135 people yielded the following
10. In reference to question (9), which of the following is/are true?
(A) There is not a significant association between caffeine and migraines (B) The test statistic does not fall in the rejection region
(C) The critical value is equal to 7.38
D) The expected counts eij are computed assuming caffeine and migraines are independent
Step by step
Solved in 3 steps
