Consider a drug that is used to help prevent blood clots in certain patients. In clinical? trials, among 6221 patients treated with this? drug, 157 developed the adverse reaction of nausea. Use a 0.05 significance level to test the claim that 3?% of users develop nausea. Does nausea appear to be a problematic adverse? reaction?

What is the test statistic?

What is the P-value?

-In a test of the effectiveness of garlic for lowering? cholesterol, 81 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes? (before minus? after) in their levels of LDL cholesterol? (in mg/dL) have a mean of 0.1 and a standard deviation of 2.19. Use a 0.10 significance level to test the claim that with garlic? treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic? treatment? Assume that a simple random sample has been selected. Identify the null and alternative?hypotheses, test? statistic, P-value, and state the final conclusion that addresses the original claim.

What is the test statistic? (round 2 decimal place)

What is the P-value? (round 3 decimal places)

-You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you? survey? Assume that you want to be 90?% confident that the sample percentage is within 2.5 percentage points of the true population percentage. Complete parts? (a) and? (b) below.

Assume that nothing is known about the percentage of passengers who prefer aisle seats.

N= ?

2. Assume that a prior survey suggests that about 38?% of air passengers prefer an aisle seat.

N=?

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