Asked Jan 17, 2020

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?

Atorvastatin 10 mg
Atorvastatin 40 mg
Atorvastatin 80 mg
No Infection

Image Transcriptionclose

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


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

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in



Related Statistics Q&A

Find answers to questions asked by student like you
Show more Q&A

Q: Prisoners. From the U.S. Census Bureau and the article “U.S. Prison Population Falls for Third Year”...

A: Consider X be a random variable which follows Poisson distribution indicating the Americans in priso...


Q: Expressing Confidence Intervals Example 2 showed how the statistics of n = 22 and =14.3 result in th...

A: Click to see the answer


Q: Headache Treatment In a study of treatments for very painful “cluster” headaches, 150 patients were ...

A: The test hypotheses are:Null hypothesis:H0: p1 = p2, that is, the effect of oxygen treatment and pla...


Q: Using Normal Approximation. In Exercises 5–8, do the following: If the requirements of np ≥ 5 and nq...

A: The probability for guessing the correct answer is p  = 0.2.The probability for not guessing the cor...


Q: Standard Normal Distribution. In Exercises 17–36, assume that a randomly selected subject is given a...

A: The probability of the given bone density test scores is Between and −2.55 and −2.00 is obtained by ...


Q: Construct a Venn diagram representing the event a.(not E).b.(A or B).

A: a)Venn diagramVenn diagram is a diagrammatic representation of sets which shows the relationship bet...


Q: Lefties In a random sample of males, it was found that 23 write with their left hands and 217 do not...

A: a.The test hypotheses are:Null hypothesis:H0: p1 = p2, that is, there is no difference in the rate o...


Q: Tips Listed below are amounts of bills for dinner and the amounts of the tips that were left. The da...

A: The data of bills for dinner and amounts of the tips that were left are shown below.Let us consider ...


Q: Accuracy of Fast Food Drive-Through Orders In a study of Burger King drive-through orders, it was fo...

A: a)State the appropriate hypothesis:Let the first population denote Burger King and the second popula...