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Asked Jan 17, 2020
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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 (Lipitor) treatment appear to have an effect on infections?

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

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Expert Answer

Step 1

The hypotheses are stated below:

Null hypothesis:

H0: Getting an infection is independent of the treatment.

Alternative hypothesis:

Ha: Getting infection and the treatment are dependent.

The chi-square statistic is obtained below:

Instructions to obtain the value of the test statistic using MegaStat:

  1. In EXCEL,...
Statistics homework question answer, step 1, image 1
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