[EX02-001] Students in a statistics course offered over the Internet were asked how many different Internet activities they engaged in during a typical week. The following data show the number of activities:

6 7 3 6 9 10 8 9 9 6 4 9 4 9 4 2 3 5 13 12 4 6 4 9 5 6 9 11 5 6 5 3 7 9 6 5 12 2 6 9

a. List all types of charts and graphs shown in Chapter 2 that would be appropriate for use with the set of 40 data listed.

b. What types of graphs would not be appropriate?

Explain why.

c. Display the data using each of the charts and graphs listed in part a.

d. Which graph do you think best represents the data? Explain why.

e. Find the five measures of central tendency for these data (mean, median, mode, midrange, and midquartile).

f. Find the three measures of dispersion for the data (range, variance, and standard deviation).
g. Find the value of several measures of position:
P5, P10, Q1, Q3, P90, and P98.
h. How many different Internet activities do you engage in during a typical week? Using the mean and standard deviation calculated in parts e and

f, determine your z-score. What is this telling you about yourself with respect to statistics students’ Internet usage?
i. Use one graph from part c plus at least one measure of central tendency and one measure of dispersion, and write a description of statistics students’ Internet usage, number of Internet activities per week.
j. According to the empirical rule, if the distribution is normal, approximately 68% of the number of different Internet activities engaged in by statistics students will fall between what two values? Is this true? Why or why not?
k. According to Chebyshev’s theorem, approximately 75% of the number of different Internet activities engaged in by statistics students will fall within what two values? Is this true?
Why or why not?
l. The sample information pictured in Section 2.1’s “What Users do on the Internet” graph on page 39 is different than, but related to, the sample information you have been working with in parts a through k. Describe the data collected for the graph in Section 2.1 and explain how they differ from the data listed here.