Chapter 1: Q 102. (page 73)
Which of the distributions shown has a larger standard deviation? Justify your answer.

Short Answer
The graph of a variable will have a higher standard deviation.
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Chapter 1: Q 102. (page 73)
Which of the distributions shown has a larger standard deviation? Justify your answer.

The graph of a variable will have a higher standard deviation.
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Smoking by students and parents Refer to Exercise 20. Calculate three conditional distributions of students’ smoking behavior: one for each of the three parental smoking categories. Describe the relationship between the smoking behaviors of students and their parents in a few sentences.
1. Use the back-to-back stemplot in Figure to write a few sentences comparing the number of pairs of shoes owned by males and females. Be sure to address shape, center, spread, and outliers.

Do women study more than men? We asked the students in a large first-year college class how many minutes they studied on a typical weeknight. Here are
the responses of random samples of women and men from the class:

(a) Examine the data. Why are you not surprised that most responses are multiples of 10 minutes? Are there any responses you consider suspicious?
(b) Make a back-to-back stem plot to compare the two samples. Does it appear that women study more than men (or at least claim that they do)? Justify your answer.
A survey was designed to study how business operations vary according to their size. Companies were classified as small, medium, or large. Questionnaires were sent to randomly selected businesses of each size. Since not all questionnaires in a survey of this type are returned, researchers decided to investigate the relationship between the response rate and the size of the business. The data are given in the following two-way table.

What percent of all small companies receiving questionnaires responded?
What do they measure? For each of the following summary statistics, decide (i) whether it could be used to measure center or spread and (ii) whether it is resistant.
(a)
(b)
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