24. After smoking marijuana, 7 out of 100 subjects failed a driving test. Only 7 out of 140 subjects not under the influence of marijuana failed the test. Let p1 denote the population proportion of marijuana users that fail the test, and let p2 denote the population proportion of users not under the influence that fail the test. Find an 80% confidence interval for p1 − p2. In reference to question (24), which of the following is/are true? (A) There is a significant difference between p1 and p2 (B) If we were to test H0 : p1 = p2 versus Ha : p1 doesn't equal p2 at the α = 0.20 significance level, the p−value for the test would be less than 0.20 (just think about this one; no computations necessary) (C)If we were to testH0 :p1 =p2+0.2 versus Ha :p1 doesn't equal p2+0.2at the α=0.20 significance level,the p−value for the test would be greater than 0.20 (just think about this one; no computations necessary) Answer choices (B) and (C) (A) and (C) (A) only (A) and (B) None of the other answers are correct (B) only
24. After smoking marijuana, 7 out of 100 subjects failed a driving test. Only 7 out of 140 subjects not under the influence of marijuana failed the test. Let p1 denote the population proportion of marijuana users that fail the test, and let p2 denote the population proportion of users not under the influence that fail the test. Find an 80% confidence interval for p1 − p2.
In reference to question (24), which of the following is/are true?
(A) There is a significant difference between p1 and p2
(B) If we were to test H0 : p1 = p2 versus Ha : p1 doesn't equal p2 at the α = 0.20 significance level, the p−value for the test would be less than 0.20 (just think about this one; no computations necessary)
(C)If we were to testH0 :p1 =p2+0.2 versus Ha :p1 doesn't equal p2+0.2at the α=0.20 significance level,the p−value for the test would be greater than 0.20 (just think about this one; no computations necessary)
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