MA 260 MA260 STATISTICAL ANALYSIS I EXAM 2 ANSWERS (2021) - ASHWORTH
Ashworth MA260 Statistical Analysis I Exam 2 Answers (2021)
1. Classify the histogram as unimodal or bimodal.
2. The following table presents the purchase totals (in dollars) of a random sample of gasoline purchases at a convenience store.
3. Classify the histogram as skewed to the left, skewed to the right, or approximately symmetric.
4. The amounts 3 and 4 are compared. Which of the following graphical displays are the least misleading?
5. The following time-series plot presents the population growth (in percent) of a suburb of Atlanta, Georgia for each of the years 1990 through 2009. Estimate the amount by which the rate of growth changed from 1,995 to 2,004.
6. The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day.
7. Construct a dotplot for the following data.
8. The following table presents the rate of population growth of a suburb of Atlanta, Georgia for each of the years 1990 through 2009. Construct a time-series plot of the growth rate.
9. Thirty households were surveyed for the number of televisions in each home. Following are the results.
10. The following table presents the purchase totals (in dollars) of a random sample of gasoline purchases at a convenience store.
11. A sample of 200 high school students were asked how many hours per week they spend watching television. The following frequency distribution presents the results.
12. The following bar graph presents the average amount a certain family spent, in dollars, on various food categories in a recent year.
13. Following is a pie chart that presents the percentages spent by a certain household on its five largest annual expenditures. What percentage of the money spent was spent on food, housing, and utilities?
14. The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day.
15. The following time-series plot presents the population growth (in percent) of a suburb of Atlanta, Georgia for each of the years 1990 through 2009. Estimate the rate of growth in 1,999.
16. The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day.
17. Construct a dotplot for the following data.
18. The following table presents the purchase totals (in dollars) of a random sample of gasoline purchases at a convenience store.
19. Toy sales: The following graph presents the percent market share for the US Toy Retail Sales between brick and mortar toy sales and online sales for the years 2011-2015. Does the graph present an accurate picture of the differences in revenue from these two sources? Or is it misleading?
20. The following frequency distribution presents the weights in pounds (lb) of a sample of visitors to a health clinic.
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