In a national survey conducted by the Centers for Disease Control to determine health-risk behaviors among college students, college students were asked, “How often do you wear a seat belt when driving a car?” The frequencies were as follows:

Response .......Frequency

I do not drive a car ... 249

Never ......... 118

Rarely ......... 249

Sometimes ...... 345

Most of the time .... 716

Always ........3093

(a) Construct a relative frequency distribution.

(b) What percentage of respondents answered “Always”?

(c) What percentage of respondents answered “Never” or “Rarely”?

(d) Construct a frequency bar graph.

(e) Construct a relative frequency bar graph.

(f ) Construct a pie chart.

(g) Compute the relative frequencies of “Never,” “Rarely,” “Sometimes,” “Most of the time,” and “Always,” excluding those that do not drive. Compare with those in Problem 13. What might you conclude?

(h) Suppose that a representative from the Centers for Disease Control says, “2.5% of the college students in this survey responded that they never wear a seat belt.” Is this a descriptive or inferential statement?