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Chapter 1: Q 93. (page 75)
House prices The mean and median selling prices of existing single-family homes sold in September 2016 were \(276,200 and \)234,200. Which of these numbers is the mean and which is the median? Explain your reasoning.
Mean is $276,200 and median is $234,200.
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Support the court? A news network reported the results of a survey about a controversial court decision. The network initially posted on its website a bar graph of the data similar to the one that follows. Explain how this graph is misleading. (Note: When notified about the misleading nature of its graph, the network posted a corrected version.)
Python eggsRefer to Exercise 26.
(a) Of the eggs that hatched, what proportion were randomly assigned to hot water?
(b) Of the eggs that were randomly assigned to hot water, what percent hatched?
(c) The segmented bar graph displays the distribution of hatching status by water temperature. Describe what this graph reveals about the association between these two variables for the python eggs in this experiment.
Phone navigation The bar graph displays data on the percent of smartphone owners in several age groups who say that they use their phone for turn-by-turn navigation.
(a) Describe what the graph reveals about the relationship between age group and use of smartphones for navigation.
(b) Would it be appropriate to make a pie chart of the data? Explain.
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?
Fuel efficiency The dotplot shows the difference (Highway 鈭� City) in EPA mileage ratings, in miles per gallon (mpg) for each of 24 model year 2018 cars.
Part (a). Explain what the dot above 鈭�3 represents.
Part (b). What does the graph tell us about fuel economy in the city versus on the highway for these car models? Be specific.
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