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Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola
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In Exercise, test the given claim.Clinical Trial of

Chapter 11, Problem 15BSC

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QUESTION:

Problem  15BSC

In Exercise, test the given claim.

Clinical Trial of Echinacea In a clinical trial of the effectiveness of echinacea for preventing colds, the results in the table below were obtained (based on data from “An Evaluation of Echinacea Angustifolia in Experimental Rhinovirus Infections,” by Turner et al., New England Journal of Medicine, Vol. 353, No. 4). Use a 0.05 significance level to test the claim that getting a cold is independent of the treatment group. What do the results suggest about the effectiveness of echinacea as a prevention against colds?

 

Treatment Group

 

Placebo

Echinacea: 20% extract

Echinacea: 60% extract

Got a Cold

88

48

42

Did Not Get a Cold

15

4

10

Questions & Answers

QUESTION:

Problem  15BSC

In Exercise, test the given claim.

Clinical Trial of Echinacea In a clinical trial of the effectiveness of echinacea for preventing colds, the results in the table below were obtained (based on data from “An Evaluation of Echinacea Angustifolia in Experimental Rhinovirus Infections,” by Turner et al., New England Journal of Medicine, Vol. 353, No. 4). Use a 0.05 significance level to test the claim that getting a cold is independent of the treatment group. What do the results suggest about the effectiveness of echinacea as a prevention against colds?

 

Treatment Group

 

Placebo

Echinacea: 20% extract

Echinacea: 60% extract

Got a Cold

88

48

42

Did Not Get a Cold

15

4

10

ANSWER:

Answer:

Step 1 of 2

 

Treatment Group

 

Placebo

Echinacea: 20% extract

Echinacea: 60% extract

Total

Got a Cold

88

48

42

178

Did Not Get a Cold

15

4

10

29

Total

103

52

52

207

The solution to this problem takes four steps: (1) state the hypotheses, (2) formulate an analysis plan, (3) analyze sample data, and (4) interpret results. We work through those steps below:

State the hypotheses. The first step is to state the null hypothesis and an alternative hypothesis.

H0: The claim that the amount of smoking is independent of seat belt use

H1: The claim that the amount of smoking is not independent of seat belt use

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