Question

Lipitor is a drug used to control cholesterol. In clinical trials of Lipitor, 420 subjects were treated with Lipitor and 740 subjects were given a placebo. Among those treated with Lipitor, 181 developed infections. Among those given a placebo, 274 developed infections. Test the claim that the rate of infection for those treated with Lipitor was more than rate of infection for those given a placebo. at the .05 significance level.

Claim: Select an answer u 1≠u 2 u 1 ≥ u 2 u 1 > u 2 p 1≠p 2 p 1 = p 2 u 1 = u 2 u 1 ≤ u 2 u 1 < u 2 p 1 ≤ p 2 p 1 ≥ p 2 p 1 < p 2 p 1 > p 2  which corresponds to Select an answer H0: p 1≠p 2 H1: u 1 < u 2 H1: p 1 < p 2 H1: u 1 > u 2 H0: p 1 ≤ p 2 H1: p 1≠p 2 H1: u 1≠u 2 H0: u 1 ≤ u 2 H1: p 1 > p 2 H0: p 1 = p 2

Opposite: Select an answer p 1≠p 2 p 1 ≥ p 2 u 1 > u 2 p 1 > p 2 u 1 ≥ u 2 p 1 ≤ p 2 u 1 = u 2 p 1 < p 2 u 1 < u 2 u 1≠u 2 p 1 = p 2 u 1 ≤ u 2  which corresponds to Select an answer H1: u 1 ≥ u 2 H1: p 1 > p 2 H0: p 1≠p 2 H1: u 1 = u 2 H1: u 1 <= u 2 H1: p 1≠p 2 H0: u 1≠u 2 H0: u 1 > u 2 H1: p 1 < p 2 H0: p 1 ≤ p 2 H0: p 1 = p 2


The test is: Select an answer two-tailed right-tailed left-tailed

The test statistic is: zz = Select an answer 2.35 2.03 1.58 1.82 2.21

The critical value is: zαzα= Select an answer  1.93  1.64  1.51  1.41  1.49

Based on this we: Select an answer Fail to reject the null hypothesis Cannot determine anything Reject the null hypothesis Accept the null hypothesis

Conclusion There Select an answer does does not  appear to be enough evidence to support the claim that the rate of infection for those treated with Lipitor was more than rate of infection for those given a placebo..

Answer 1