Chapter 1: Q 62. (page 47)
Die rolls Imagine rolling a fair, six-sided die times. Draw a plausible graph of the distribution of die rolls. (Hint: Should you use a bar graph or a histogram?)
Short Answer

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Chapter 1: Q 62. (page 47)
Die rolls Imagine rolling a fair, six-sided die times. Draw a plausible graph of the distribution of die rolls. (Hint: Should you use a bar graph or a histogram?)

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A study among the Pima Indians of Arizona investigated the relationship between a mother’s diabetic status and the appearance of birth defects in her children. The results appear in the two-way table below.

(a) Fill in the row and column totals in the margins of the table. (b) Compute (in percents) the conditional distributions of birth defects for each diabetic status. (c) Display the conditional distributions in a graph. Don’t forget to label your graph completely. (d) Comment on any clear associations you see.
Popular colours—here and there Favorite vehicle colours may differ among countries. The side-by-sidebar graph shows data on the most popular colours of cars in 2008 for the United States and Europe. Write a few sentences comparing the two distributions.

Earthquake intensities are measured using a device called a seismograph, which is designed to be most sensitive to earthquakes with intensities between 4.0 and 9.0 the Richter scale. Measurements of nine earthquakes gave the following readings:

where L indicates that the earthquake had an intensity below 4.0 and an H indicates that the earthquake had an intensity above 9.0. The median earthquake intensity of the sample is (a) 5.75. (c) 6.47. (e) Cannot be determined. (b) 6.00. (d) 8.70.
Which of the distributions shown has a larger standard deviation? Justify your answer.

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.
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