The article "Death in Roadwork Zones at Record High" (San Luis Obispo Tribune, July 25, 2001) included a bar chart similar to this one:

a. Comment on the trend over time in the number of people killed in highway work zones.

b. Would a pie chart have also been an effective way to summarize these data? Explain why or why not.

Year 66. 86. 16. 96. 56. 16. 6. 76. 16. O 001 200 300 Number of deaths 00 005 009 700 800 006