The following questions are examples of exam questions for chapter 2
1) Every spring semester, the School of Business coordinates a
luncheon with local business leaders for graduating seniors, their
families, and their friends. Corporate sponsorship pays for the lunches
of each of the seniors, but students have to purchase tickets to cover
the cost of lunches served to guests they bring with them. The
following histogram represents the attendance at the senior luncheon,
where X is the number of guests each student invited to the luncheon
and f is the number of students in each category. How many
graduating seniors attended the luncheon?
Absolute Frequency Histogram
200
152
f
150
85
100
50
18
17
3
0
4
5
0
0
1
2
3
Number of Guests
the number of seniors is equal to the sum of all the frequencies for
each class of senior, by number of guests = 17+152+85+18+3=275.
A professor of economics at a small Texas university wanted to determine
what year in school students were taking his tough economics course.
Shown below is a pie chart of the results. What percentage of the class
took the course prior to reaching their senior year?
Seniors
14%
Juniors
30%
Freshmen
10%
Sophomor
es
46%
86% of students (100%-14%) took the course before their senior year
The Stem-and-Leaf display below contains data on the number of months
between the date a civil suit is filed and when the case is actually
adjudicated for 50 cases heard in superior court.
Stem
1L
1H
2L
2H
3L
3H
4L
4H
5L
5H
6L
6H
Leaves
23444
7899
222234
55678889
001113
5778
0234
5579
1124
66
1
58
Note: 1L means the "low teens"Ñ10, 11, 12, 13, or 14; 1H means the "high
teens"Ñ15, 16, 17, 18, or 19; 2L means the "low twenties"Ñ20, 21, 22, 23,
or 24, etc.
a) Locate the first leaf, i.e., the smallest leaf with the smallest
stem. This represents a wait of ___12____ months.
b) The civil suit with the longest wait between when the suit was
filed and when it was adjudicated had a wait of ___68___
months.
c) The civil suit with the fourth shortest waiting time between when
the suit was filed and when it was adjudicated had a wait of
___56___ months.
d) What percent of the cases were adjudicated within the first 2
years? 15 / 50 = 30%
4) The table below contains the opinions of a sample of 200 people
broken down by gender about the latest congressional plan to eliminate
anti-trust exemptions for professional baseball.
38
12
54
36
12
48
Row
Totals
104
96
50
90
60
200
For Neutral Against
Female
Male
Column
Totals
a) How do you construct a table of total percentages? By dividing
all frequency counts for each gender-opinion pair by 200,
which is the grand total number of responses
b) Of those neutral in the above sample, what percent were
males? 36/90 = 40%
c) What percent of the 200 were females who were either neutral
or against the plan? (54 + 12) / 200 = 33%
d) What percent of the 200 were males who were not against the
plan? 100% - (48/200) = 76%