# Question

Table 9.3 indicates the population (in millions) and the number of violent crimes (in millions) in the United States from 1982 to 1991, as reported in the World Almanac and Book of Facts (1993, p. 948). (Thankfully, both numbers and rates of violent crime started dropping in 1992 and have continued to do so. Thus, the data for this exercise end in 1991 to illustrate the increasing trend up to that time.)

a. Draw two line graphs representing the trend in violent crime over time. Draw the first graph to try to convince the reader that the trend is quite ominous. Draw the second graph to try to convince the reader that it is not. Make sure all of the other features of your graph meet the criteria for a good picture.

b. Draw a scatterplot of population versus violent crime, making sure it meets all the criteria for a good picture. Comment on the scatterplot. Now explain why drawing a line graph of violent crime versus year, as in part (a) of this exercise, might be misleading.

c. Rather than using number of violent crimes on the vertical axis, redraw the first line graph (from part [a]) using a measure that adjusts for the increase in population. Comment on the differences between the two graphs.

a. Draw two line graphs representing the trend in violent crime over time. Draw the first graph to try to convince the reader that the trend is quite ominous. Draw the second graph to try to convince the reader that it is not. Make sure all of the other features of your graph meet the criteria for a good picture.

b. Draw a scatterplot of population versus violent crime, making sure it meets all the criteria for a good picture. Comment on the scatterplot. Now explain why drawing a line graph of violent crime versus year, as in part (a) of this exercise, might be misleading.

c. Rather than using number of violent crimes on the vertical axis, redraw the first line graph (from part [a]) using a measure that adjusts for the increase in population. Comment on the differences between the two graphs.

## Answer to relevant Questions

Collect some categorical data on a topic of interest to you, and represent it in a statistical picture. Explain what you have done to make sure the picture is as useful as possible. Explain how two variables can have a perfect curved relationship and yet have zero correlation. Draw a picture of a set of data meeting those criteria. The original data for the putting success of professional golfers included values beyond those we used in Exercise 22 (5 feet to 15 feet), in both directions. At a distance of 2 feet, 93.3% of the putts were successful. At a ...Measure the heights and weights of 10 friends of the same sex. Draw a scatterplot of the data, with weight on the vertical axis and height on the horizontal axis. Using a computer or calculator that produces regression ...Explain why it would probably be misleading to use correlation to express the relationship between number of acres burned and number of deaths for major fires in the United States.Post your question

0