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Get Full Access to Elementary Statistics - 12 Edition - Chapter 11.3 - Problem 19bsc
Get Full Access to Elementary Statistics - 12 Edition - Chapter 11.3 - Problem 19bsc

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# Clinical Trial of Lipitor Lipitor is the trade name of the

ISBN: 9780321836960 18

## Solution for problem 19BSC Chapter 11.3

Elementary Statistics | 12th Edition

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Problem 19BSC

Problem  19BSC

Clinical Trial of Lipitor Lipitor is the trade name of the drug atorvastatin, which is used to reduce cholesterol in patients. (Until its patent expired in 2011, this was the largest-selling drug in the world, with annual sales of \$13 billion.) Adverse reactions have been studied in clinical trials, and the table below summarizes results for infections in patients from different treatment groups (based on data from Parke-Davis). Use a 0.01 significance level to test the claim that getting an infection is independent of the treatment. Does the atorvastatin treatment appear to have an effect on infections?

 Placebo Atorvastatin 10 mg Atorvastatin 40 mg Atorvastatin 80 mg Infection 27 89 8 7 No Infection 243 774 71 87

Step-by-Step Solution:

Solution  19BSC

Step 1 of 1

We are given a data set of infections among people given different groups of treatments. We have to test the claim that getting an infection is independent of the treatment.

Step 1: To test the claim we need to fulfil certain assumptions.

1. We assume that the sample has been randomly selected because of the structure of the study.

2. The results are tabulated as frequencies.

3. The expected frequencies are more than five in every column.

Step 2 of 4

Step 3 of 4

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