1.2 Gender: categorical. Age: Quantitative. Household income: quantitative. Voting
Democratic/Republican: categorical
1.11 Possible answers are total profits, number of employees, total value of stock, and total assets.
1.17 There are two peaks. Most of the ACT states are located in the upper portion of the distribution, since
in such states, only the stronger students take the SAT.
1.25
a) Preferences will vary. The first plot has the advantage of being compact, while the split stems suggest
that there may be a second peak.
b) In either plot, the distribution is roughly symmetric, with center around 12.6 or 12.7 percent. Alaska
and Florida appear to be outliers; Alaska is low presumably because of its less attractive climate, while
Florida is high because many retirees move there.
4 9
5
5
6
6
7
7
8
8 8
9
9
10 002
10 9
11 0113444
11 69
12 00344
12 5556666
13 013344
13 5677999
14 234
14 55
15 23
15 79
16
16
17
17
18
18 6
4 9
5
6
7
8 8
9
10 0029
11 011344469
12 003445556666
13 0133445677999
14 23455
15 2379
16
17
18 6
