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Chapter 1: Q 107. (page 77)
File sizes Refer to Exercises 101 and 105. Identify any outliers in the distribution. Show your work.
There are no outliers.
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Risks of playing soccer (1.1) A study in Sweden looked at former elite soccer players, people who had played soccer but not at the elite level, and people of the same age who did not play soccer. Here is a two-way table that classifies these individuals by whether or not they had arthritis of the hip or knee by their mid-fifties:
Part (a). What percent of the people in this study were elite soccer players? What percent of the people in this study developed arthritis?
Part (b). What percent of the elite soccer players developed arthritis? What percent of those who got arthritis were elite soccer players?
Part (c). Researchers suspected that the more serious soccer players were more likely to develop arthritis later in life. Do the data confirm this suspicion? Calculate appropriate percentages to support your answer.
Who goes to movies?The bar graph displays data on the percent of people in several age groups who attended a movie in the past 12 months.
(a) Describe what the graph reveals about the relationship between age group and movie attendance.
(b) Would it be appropriate to make a pie chart of the data? Explain.
Multiple Choice Select the best answer.
Exercises 9 and 10 refer to the following setting. At the Census Bureau website www.census.gov, you can view detailed data collected by the American Community Survey.
The following table includes data for 10 people chosen at random from the more than 1 million people in households contacted by the survey. 鈥淪chool鈥� gives the highest level of education completed.
This data set contains
(a) 7 variables, 2 of which are categorical.
(b) 7 variables, 1 of which is categorical.
(c) 6 variables, 2 of which are categorical.
(d) 6 variables, 1 of which is categorical.
(e) None of these.
Birth months Imagine asking a random sample of 60 students from your school about their birth months. Draw a plausible (believable) graph of the distribution of birth months. Should you use a bar graph or a histogram to display the data?
I鈥檇 die without my phone! In a survey of over 2000 U.S. teenagers by Harris Interactive, 47% said that 鈥渢heir social life would end or be worsened without their cell phone.鈥� 46 One survey question asked the teens how important it is for their phone to have certain features. The following figure displays data on the percent who indicated Page Number: 83 Page Number: 84 that a particular feature is vital.
Part (a). Explain how the graph gives a misleading impression.
Part (b). Would it be appropriate to make a pie chart to display these data? Why or why not?
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