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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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Pulse rates Here are data on the resting pulse rates (in beats per minute) of 19 middle school students:
(a) Calculate the mean. Show your work.
(b) The student with a 120 pulse rate has a medical issue. Find the mean pulse rate for the other 18 students. What property of the mean does this illustrate?
Carbon dioxide emissions Burning fuels in power plants and motor vehicles emits carbon dioxide (CO2 ), which contributes to global warming. The table displays CO2 emissions per person from countries with populations of at least 20 million. 30
Part (a). Make a histogram of the data using intervals of width 2, starting at 0.
Part (b). Describe the shape of the distribution. Which countries appear to be outliers
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.
Protecting woodWhat measures can be taken, especially when restoring historic wooden buildings, to help wood surfaces resist weathering? In a study of this question, researchers prepared wooden panels and then exposed them to the weather. Some of the variables recorded were type of wood (yellow poplar, pine, cedar); type of water repellent (solvent based, water-based); paint thickness (millimeters); paint color (white, gray, light blue); weathering time (months). Classify each variable as categorical or quantitative.
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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