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Chapter 2: Q. 42 (page 133)
Find the mean for the following frequency tables
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Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a middle-class income?" The results are in Table 2.69. Also, include left endpoint, but not the right endpoint.
a. What percentage of the survey answered "not sure"?
b. What percentage think that middle-class is from \(25,000 to \)50,000? c. Construct a histogram of the data.
i. Should all bars have the same width, based on the data? Why or why not?
ii. How should the <20,000 and the 100,000+ intervals be handled? Why? d. Find the 40th and 80th percentiles
e. Construct a bar graph of the data
For the -meter dash, the third quartile for times for finishing the race was seconds. Interpret the third quartile in the context of the situation.
a. For runners in a race, a higher speed means a faster run. Is it more desirable to have a speed with a high or a low percentile when running a race?
b. The percentile of speeds in a particular race is miles per hour. Write a sentence interpreting the percentile in the context of the situation.
For each of the following data sets, create a stem plot and identify any outliers.
The miles per gallon rating for cars are shown below (lowest to highest).
The following data show the distances (in miles) from the homes of off-campus statistics students to the college. Create a stem plot using the data and identify any outliers:
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