Statistics for The Behavioral Sciences (MindTap Course List)
Statistics for The Behavioral Sciences (MindTap Course List)
10th Edition
ISBN: 9781305504912
Author: Frederick J Gravetter, Larry B. Wallnau
Publisher: Cengage Learning
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Chapter 17, Problem 11P
To determine

Whether the distribution of preferences for older adults is significantly different from the distribution for college students.

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In Problem 10, a researcher asked college students to evaluate three new cell phone designs. However, the researcher suspects that college students may have criteria that are different from those used by older adults. To test this hypothesis, the researcher repeats the study using a sample of n=60 older adults in addition to a sample of n=60 students. The distribution of preference is as follows:   Design 1 Design 2 Design 3 Total Student 27 20 13 60 Older Adult 21 34 5 60 Total 48 54 18   Do the data indicate that the distribution of preferences for older adults is significantly different from the distribution for college students? Test with α=.05.
Suppose we are now interested in taking random samples of 800 US adults instead of 150 and considering the sampling distribution of the corresponding sample proportions. What effect, if any, does this increase in sample size have on the mean of the possible sample proportion values? A. INCREASE  B. DECREASE  C. STAY THE SAME
Suppose we examined medical records of 500 individuals admitted to the hospital, and we cross-classified them by whether they had lung disease or some other disease and the number of cigs they smoked daily.  The individuals in the sample were distributed as follows 1.What proportion of the sample both had lung cancer and smoked 25 or more cigs per day?  2.Of all individuals who had lung cancer, what proportion smoked fewer than 25 cigs per day?  3.What proportion of individuals in the sample smoked fewer than 25 cigs per day?
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