(a) Explanation Given info: In a survey, the researchers reported that two age groups they examined for cardiac disease. The mean age of 2,397 patients without cardiac disease was 69.8 with standard deviation 8.7 years. The mean age of 450 patients with cardiac disease was 74 with standard deviation 7.9 years. It was found that 32% of the diseased group was smokers and 23.7 % are free of heart disease. Calculation: The assumption and conditions for inference: (i) Randomization condition: It can be assumed that the patients are representative of all people. (ii) Independent sample condition: The two groups of people are independent to each other. (iii) Success/failurecondition: Here for cardiac patients, n p ^ = 450 × 0.32 = 144 and n q ^ = 450 × 0.68 = 306 and for none cardiac patients, n p ^ = 2 , 397 × 0 (b) To determine Check whether there is any evidence that the two groups in the study were different. (c) To determine Explain the problem that is arising in analyzing the results of the study.

Intro Stats, Books a la carte Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (5th Edition)

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ISBN: 9780134210247

Author: Richard D. De Veaux, Paul Velleman, David E. Bock

Publisher: PEARSON

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Chapter R, Problem 5.18RE

(a)

To determine

Create a 95% confidence interval for the difference for the difference in the proportion of smokers in the two groups.

(b)

To determine

Check whether there is any evidence that the two groups in the study were different.

(c)

To determine

Explain the problem that is arising in analyzing the results of the study.

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Chapter R, Problem 5.17RE

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Create a 95% confidence interval for the difference for the difference in the proportion of smokers in the two groups.

Solution Summary: The author calculates the 95% confidence interval for the difference in the proportion of smokers in two groups using the MINITAB software.

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Create a 95% confidence interval for the difference for the difference in the proportion of smokers in the two groups.

Check whether there is any evidence that the two groups in the study were different.

Explain the problem that is arising in analyzing the results of the study.

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Chapter R Solutions