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Chapter 1: Q 99. (page 76)
Foot lengths Here are the foot lengths (in centimeters) for a random sample of seven 14-year-olds from the United Kingdom:
Calculate the standard deviation. Interpret this value.
The standard deviation is 2.5166 cm.
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Hispanic origins Here is a pie chart prepared by the Census Bureau to show the origin of the more than 50 million Hispanics in the United States in 2010. About what percent of Hispanics are Mexican? Puerto Rican?
You look at real estate ads for houses in Naples, Florida. There are many houses ranging from \(200,000 to \)500,000 in price. The few houses on the water, however, are priced up to $15 million. The distribution of house prices will be
a. skewed to the left.
b. roughly symmetric.
c. skewed to the right.
d. single-peaked.
e. too high.
Body imageA random sample of 1200 U.S. college students was asked, “What is your perception of your own body? Do you feel that you are overweight, underweight, or about right?” The two-way table summarizes the data on perceived body image by gender.
(a) What percent of respondents feel that their body weight is about right?
(b) What proportion of the sample is female?
(c) What percent of respondents are males and feel that they are overweight or underweight?
Binge-watchingDo you “binge-watch” television series by viewing multiple episodes of a series at one sitting? A survey of 800 people who binge-watch were asked how many episodes is too many to watch in one viewing session. The results are displayed in the bar graph. Explain how this graph is misleading.
Who studies more? Researchers asked the students in a large first-year college class how many minutes they studied on a typical weeknight. The back-to-back stemplot displays the responses from random samples of 30 women and 30 men from the class, rounded to the nearest 10 minutes. Write a few sentences comparing the male and female distributions of study time.
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