Statistics for Engineers and Scientists
4th Edition
ISBN: 9780073530789
Author: Navidi
Publisher: MCG
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Textbook Question
Chapter 9.2, Problem 4E
Refer to Exercise 2 in Section 9.1.
a. Use the Bonferroni method to determine which means, if any, differ front the
b. Use the Tukey–Kramer method to determine which means, if any, differ from the mean of the control group at the 5% level.
c. Which is the more powerful method to find the treatments whose mean differs from that of the control group, the Bonferroni method or the Tukey–Kramer method?
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which of the following individuals is likely to be excluded from a clinical trial?
a-individual with other diseases besides the disease of interest
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In the book Business Research Methods (5th ed.), Donald R. Cooper and C. William Emory discuss studying the relationship between on-the-job accidents and smoking. Cooper and Emory describe the study as follows:
Suppose a manager implementing a smoke-free workplace policy is interested in whether smoking affects worker accidents. Since the company has complete reports of on-the-job accidents, she draws a sample of names of workers who were involved in accidents during the last year. A similar sample from among workers who had no reported accidents in the last year is drawn. She interviews members of both groups to determine if they are smokers or not.
The sample results are given in the following table.
On-the-Job Accident
Smoker
Yes
No
Row Total
Heavy
12
5
17
Moderate
9
10
19
Nonsmoker
13
17
30
Column total
34
32
66
Expected counts are below observed counts
Accident
No Accident
Total
Heavy
12
5
17
8.76
8.24…
This problem is based on information taken from The Merck Manual (a reference manual used in most medical and nursing schools). Diltiazem is a commonly prescribed drug for hypertension. However, diltiazem causes headaches in about 12% of patients using the drug. It is hypothesized that regular exercise might help reduce the headaches. If a random sample of 205 patients using diltiazem exercised regularly and only 15 had headaches, would this indicate a reduction in the population proportion of patients having headaches? Use a 1% level of significance.
1. What is the value of the sample test statistic? (Round your answers to two decimal places.)
2. Find the P-value of the test statistic. (Round your answers to four decimal places.)
Chapter 9 Solutions
Statistics for Engineers and Scientists
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