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Chapter 1: Q T1.7. (page 79)
Forty students took a statistics examination having a maximum of points. The score distribution is given in the following stem-and-leaf plot:
The third quartile of the score distribution is equal to
The correct option is (b)
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A study among the Pima Indians of Arizona investigated the relationship between a mother鈥檚 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鈥檛 forget to label your graph completely. (d) Comment on any clear associations you see.
The histogram below shows the distribution of the per cent of women aged 15 and over who have never married in each of the 50 states and the District of Columbia.
The center of this distribution is in the interval
(a) to
(b) to
(c)
(d) to
(e)to
The figure displays computer output from Data Desk for data on the amount spent by grocery shoppers.
(a) What would you guess is the shape of the distribution based only on the computer output? Explain.
(b) Interpret the value of the standard deviation.
(c) Are there any outliers? Justify your answer.
The histogram below shows the distribution of the percent of women aged and over who have never married in each of the states and the District of Columbia.
The leftmost bar in the histogram covers percent of never-married women ranging from about
(a)
(d)
(b)
(e) None of these.
(c)
Cool car colors The most popular colors for cars and light trucks change over time. Silver passed green in to become the most popular color worldwide, then gave way to shades of white in . Here is the distribution of colors for vehicles sold in North America in
(a) What percent of vehicles had colors other than those listed?
(b) Display these data in a bar graph. Be sure to label your axes and title your graph.
(c) Would it be appropriate to make a pie chart of these data? Explain.
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