MAT 155 Chapter 3
The following is a brief review of Chapter 3. This
does NOT cover all the material in that
chapter.
Click on Slide Show and View Slide Show.
Read and note your answer to the question.
Advance the slide to see the answer.
Thanks to Ms. Valerie Melvin for her portion of this review.
Dr. Claude Moore, Math Instructor, CFCC
Which measure of center is the only
one that can be used with data at the
nominal level of measurement?
1. Mean
2. Median
3. Mode
Which of the following measures of
center is not affected by outliers?
1. Mean
2. Median
3. Mode
Find the mode for the given sample
data. 79, 25, 79, 13, 25, 29, 56, 79
1.
2.
3.
4.
79
48.1
42.5
25
Which is not true about the variance?
1. It is the square of the standard deviation.
2. It is a measure of the spread of data.
3. The units of the variance are different
from the units of the original data.
4. It is not affected by outliers.
Weekly sales for a company average
$10,000 with a standard deviation of
$450. Sales for the past week were
$9050. This is
1. unusually high.
2. unusually low.
3. about right.
In a data set with a range of 55.1 to
102.8 and 300 observations, there are
207 data points with values less than
88.6. Find the percentile for 88.6.
1.
2.
3.
4.
32
116.03
69
670
Which graphic display shows the least
detailed information?
1. Histogram
2. Stem-and-leaf plot
3. Boxplot
Last year, nine employees of an
electronics company retired. Find the
mean retirement age: 52, 50, 60, 68,
64, 50, 64, 58, 50.
1.
2.
3.
4.
56.1 years
56.7 years
58.0 years
57.3 years
Listed below are the amounts of time
(in months) that the employees of an
electronics company have been
working at the company. Find the
midrange. 120, 203, 250, 132, 290
1.
2.
3.
4.
70 months
66.5 months
61 months
85 months
Jeanne is currently taking college
zoology. The instructor often gives
quizzes. On the past five quizzes,
Jeanne got the following scores: 18,
16, 3, 1, 20. Find the variance.
1.
2.
3.
4.
107.3
79.3
63.4
79.2
The maximum value of a distribution is
47.5 and the minimum value is 4.0.
Use the range rule of thumb to
estimate the standard deviation.
Round results to the nearest tenth.
1.
2.
3.
4.
7.9
18.9
10.9
15.9
Which score has the highest relative
position: a score of 51.5 on a test for
which the mean is 47 and s = 9; a score of
5.9 on a test for which the mean is 4.2 and
s = 1.2; or a score of 460.8 on a test for
which the mean is 444 and s = 42?
1. A score of 51.5
2. A score of 460.8
3. A score of 5.9