Problem 2 or 4:
Classify each of the following variables as qualitative or quantitative.
If quantitative, as discrete or continuous:
a)occupation; b)region of residence; c) weight;
d)age; e)number of automobiles owned.
a) qualitative. b) qualitative. c) quantitative. continuous. d) quantitative.
continuous. e) quantitative. discrete.
Problem 3 or 5:
A study on college students found that the men had an average weight
of about 66 kg and an SD of about 9 kg. The women had an average weight of about 55 kg
and a SD of 9 kg.
(1) Find the averages and SDs, in pounds (1 kg=2.2 lb).
(2 pts)
(2) Just roughly, what percentage of the men weighed between 57 kg and 75 kg?
1

0-5
5-15
20-25
30-35
45-55
55-65
65-75
75-over
Age
% Population per age
0
1
2
3
4
5
6
7
Figure 1.
Histogram of the population distribution by age.
(1.5 pt)
(3) If you took the men and women together, would the SD of their weights be smaller
that 9 kg, just about 9 kg? Why?
(1.5 pt)
(1)
. Averages are 145.2 lb and 121 lb for men and women separately. SDs are 19.8 lb for
men and women respectively.