Fundamentals of Biostatistics
8th Edition
ISBN: 9781305268920
Author: Bernard Rosner
Publisher: Cengage Learning
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Textbook Question
Chapter 10, Problem 2P
Consider the Physicians’ Health Study data presented in Example 10.37 (p. 411).
10.1 How many participants need to be enrolled in each group to have a 90% chance of detecting a significant difference using a two-sided test with α = .05 if compliance is perfect?
Answer Problem 10.1 if compliance is as given in Example 10.37.
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Question 17: A well-known brokerage firm executive claimed that 90% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 100 people, 81% of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is smaller than 90% at the 0.05 significance level.The null and alternative hypothesis would be:
H0:p≤0.9H0:p≤0.9H1:p>0.9H1:p>0.9
H0:μ≤0.9H0:μ≤0.9H1:μ>0.9H1:μ>0.9
H0:μ≥0.9H0:μ≥0.9H1:μ<0.9H1:μ<0.9
H0:μ=0.9H0:μ=0.9H1:μ≠0.9H1:μ≠0.9
H0:p=0.9H0:p=0.9H1:p≠0.9H1:p≠0.9
H0:p≥0.9H0:p≥0.9H1:p<0.9H1:p<0.9
The test is:
two-tailed
right-tailed
left-tailed
The test statistic is: (to 3 decimals)The p-value is: (to 4 decimals)Based on this we:
Fail to reject the null hypothesis
Reject the null hypothesis
Question 9
A well-known brokerage firm executive claimed that 60% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 100 people, 61% of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is larger than 60% at the 0.10 significance level.The null and alternative hypothesis would be:
H0:μ≤0.6H0:μ≤0.6H1:μ>0.6H1:μ>0.6
H0:p≥0.6H0:p≥0.6H1:p<0.6H1:p<0.6
H0:p≤0.6H0:p≤0.6H1:p>0.6H1:p>0.6
H0:μ≥0.6H0:μ≥0.6H1:μ<0.6H1:μ<0.6
H0:μ=0.6H0:μ=0.6H1:μ≠0.6H1:μ≠0.6
H0:p=0.6H0:p=0.6H1:p≠0.6H1:p≠0.6
The test is:
left-tailed
right-tailed
two-tailed
The test statistic is: (to 2 decimals)The p-value is: (to 4 decimals)Based on this we:
Fail to reject the null hypothesis
Reject the null hypothesis
If the value of Cronbach’s alpha is 0.07, it means ___________;
a.
Research instrument is not reliable
b.
Research instrument is internally consistent
c.
Data is reliable
d.
Data is internally consistent
Chapter 10 Solutions
Fundamentals of Biostatistics
Ch. 10.2 - What is a contingency table?Ch. 10 - Consider the Physicians Health Study data...Ch. 10 - Consider the Physicians Health Study data...Ch. 10 - Answer Problem 10.1 if a one-sided test with power...Ch. 10 - Consider the Physicians Health Study data...Ch. 10 - Answer Problem 10.4 if compliance is as given in...Ch. 10 - Consider the Physicians Health Study data...Ch. 10 - Consider the Physicians Health Study data...Ch. 10 - Gastroenterology Two drugs (A, B) are compared for...Ch. 10 - Gastroenterology Two drugs (A, B) are compared for...
Ch. 10 - Gastroenterology Two drugs (A, B) are compared for...Ch. 10 - Sexually Transmitted Disease Suppose researchers...Ch. 10 - Cancer A 1980 study investigated the relationship...Ch. 10 - Ophthalmology Retinitis pigmentosa is a disease...Ch. 10 - Pulmonary Disease One important aspect of medical...Ch. 10 - Prob. 24PCh. 10 - Hepatic Disease Refer to Data Set HORMONE.DAT, at...Ch. 10 - Health Services Administration In the Harvard...Ch. 10 - Health Services Administration In the Harvard...Ch. 10 - Orthopedics A study was performed among subjects...Ch. 10 - Prob. 54PCh. 10 - Prob. 55PCh. 10 - Prob. 56PCh. 10 - Prob. 57PCh. 10 - Prob. 58PCh. 10 - Cancer A topic of current interest is whether...Ch. 10 - Cancer A topic of current interest is whether...Ch. 10 - Ophthalmology A 5-year study among 601...Ch. 10 - Prob. 74PCh. 10 - Prob. 77PCh. 10 - Prob. 87P
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