Mind on Statistics
5th Edition
ISBN: 9781285463186
Author: Jessica M. Utts, Robert F. Heckard
Publisher: Brooks Cole
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Chapter 1, Problem 1.17E
A randomized experiment was done in which overweight men were randomly assigned to either exercise or go on a diet for a year. At the end of the study there was a statistically significant difference in average weight loss for the two groups. What additional information would you need in order to determine if the difference in average weight loss had practical importance?
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Marybeth is also interested in the experiment from Problem 2 (associated with the enhancements for Captain
America's shield), so she decides to start a detailed literature review on the subject. Among others, she found
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s) What was the generator used in the 2"(4-1) fractional factorial design described in the
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Based on the resolution of this design, what do you think about the generator used in the
paper? Do you think it was a good choice, or would you have selected a different one? Explain your
answer in detail.
Suppose we wish to test the hypothesis that women with a sister’s history of breast cancer are at higher risk of developing breast cancer themselves. Suppose we assume that the prevalence rate of breast cancer is 3% among 60- to 64-year-old U.S. women, whereas it is 5% among women with a sister history. We propose to interview 400 women 40 to 64 years of age with a sister history of the disease. What is the power of such a study assuming that the level of significance is 10%?
I only need help writing the null and alternative hypotheses.
4.96 The breaking strengths for 1-foot-square samples of a particular synthetic fabric are approximately normally distributed with a mean of 2,250 pounds per square inch (psi) and a standard deviation of 10.2 psi. Find the probability of selecting a 1-foot-square sample of material at random that on testing would have a breaking strength in excess of 2,265 psi.4.97 Refer to Exercise 4.96. Suppose that a new synthetic fabric has been developed that may have a different mean breaking strength. A random sample of 15 1-foot sections is obtained, and each section is tested for breaking strength. If we assume that the population standard deviation for the new fabric is identical to that for the old fabric, describe the sampling distribution forybased on random samples of 15 1-foot sections of new fabric
Chapter 1 Solutions
Mind on Statistics
Ch. 1 - Refer to the data and five-number summaries given...Ch. 1 - A five-number summary for the heights in inches of...Ch. 1 - In recent years, Vietnamese American women have...Ch. 1 - The risk of getting lung cancer at some point in...Ch. 1 - Refer to Case Study 1.3, in which teens were asked...Ch. 1 - Using Case Study 1.6 as an example, explain the...Ch. 1 - A CBS News poll taken in December 2009, asked a...Ch. 1 - A telephone survey of 2000 Canadians conducted...Ch. 1 - In Case Study 1.3, the margin of error for the...Ch. 1 - About how many people would need to be in a random...
Ch. 1 - Prob. 1.11ECh. 1 - Prob. 1.12ECh. 1 - Prob. 1.13ECh. 1 - For each of the studies described, explain whether...Ch. 1 - Prob. 1.15ECh. 1 - Suppose that an observational study showed that...Ch. 1 - A randomized experiment was done in which...Ch. 1 - Explain the distinction between statistical...Ch. 1 - A (hypothetical) study of what people do in their...Ch. 1 - Prob. 1.20ECh. 1 - Refer to Case Study 1.6, in which the relationship...Ch. 1 - Students in a statistics class at Penn State were...Ch. 1 - Prob. 1.23ECh. 1 - Prob. 1.24ECh. 1 - An article in the magazine Science (Service, 1994)...Ch. 1 - Prob. 1.26ECh. 1 - Prob. 1.27ECh. 1 - Prob. 1.28ECh. 1 - Refer to the study in Exercise 1.28, in which...Ch. 1 - Prob. 1.30ECh. 1 - Prob. 1.31ECh. 1 - Prob. 1.32ECh. 1 - Prob. 1.33ECh. 1 - Prob. 1.34ECh. 1 - Refer to Exercise 1.33. The Roper Organization...Ch. 1 - Prob. 1.36ECh. 1 - Prob. 1.37ECh. 1 - Prob. 1.38ECh. 1 - Prob. 1.39ECh. 1 - Prob. 1.40ECh. 1 - Prob. 1.41ECh. 1 - Suppose you were to read the following news story:...Ch. 1 - Refer to Case Study 1.5. Explain what mistakes...Ch. 1 - Refer to Case Study 1.6. Go through the five steps...
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