Heal the Bay is an environmental organization that releases an annual beach report card based on water quality (Heal the Bay Beach Report Card, May 2009).

The 2009 ratings for 14 beaches in San Francisco County during wet weather were:

A1 CBAA1 A1 A A1 BDCDFF

a. Would it be appropriate to display the ratings data using a dotplot? Explain why or why not.

b. Summarize the wet weather ratings by constructing a relative frequency distribution and a bar chart.

c. The dry weather ratings for these same beaches were:

A B B A1 A F A A A A A A B A Construct a bar graph for the dry weather ratings.

d. Do the bar graphs from parts

(b) and

(c) support the statement that beach water quality tends to be better in dry weather conditions? Explain.