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Chapter 1: Q 84. (page 70)
House prices: The mean and median selling prices of existing single-family homes sold in November were and . Which of these numbers is the mean and which is the median? Explain how you know.
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A survey was designed to study how business operations vary according to their size. Companies were classified as small, medium, or large. Questionnaires were sent to 200 randomly selected businesses of each size. Since not all questionnaires in a survey of this type are returned, researchers decided to investigate the relationship between the response rate and the size of the business. The data are given in the following two-ways
Which of the following conclusions seems to be supported by the data?
(a) There are more small companies than large companies in the survey.
(b) Small companies appear to have a higher response rate than medium or big companies.
(c) Exactly the same number of companies responded as didn鈥檛 respond.
(d) Small companies dislike larger companies.
(e) If we combined the medium and large companies, then their response rate would be equal to that of the small company
C-sections Do male doctors perform more cesarean sections (C-sections) than female doctors? A study in Switzerland examined the number of cesarean sections (surgical deliveries of babies) performed in a . Section Describing Quantitative Data with Numbers year by samples of male and female doctors. Here are summary statistics for the two distributions:
(a) Based on the computer output, which distribution would you guess has a more symmetrical shape? Explain.
(b) Explain how the IQRs of these two distributions can be so similar even though the standard deviations are quite different.
(c) Does it appear that males perform more C-sections? Justify your answer
Olympic gold! The following table displays the total number of gold medals won by a sample of countries in the Summer Olympic Games in China.
(a) Make a dot plot to display these data. Describe the overall pattern of the distribution and any deviations from that pattern.
(b) Overall, countries participated in the Summer Olympics, of which won at least one gold medal. Do you believe that the sample of countries listed in the table is representative of this larger population? Why or why not?
One of the following scores was omitted from the stem plot below:
The missing number is
What are all the values that a standard deviation can possibly take?
(a)
(b)
(c)
(d)
(e) Any number
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