MATH 302 EXAM QUESTIONS AND
ANSWERS
Question 1 of 20 1.0/ 1.0 Points
A sample of 20 observations has a standard deviation of 4. The sum of the squared
deviations from the sample mean is:
A.
28
8
B.
30
4
C.
32
0
D.
40
0
Answer Key: B
Question 2 of 20 1.0/ 1.0 Points
Suppose that a histogram of a data set is approximately symmetric and "bell shaped".
Approximately what percent of the observations are within two standard deviations of the
mean?
A.
95
%
B.
68
%
C.
50
%
D.
99.
7%
Answer Key: A
Question 3 of 20 1.0/ 1.0 Points
, Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10?
ANSWERS
Question 1 of 20 1.0/ 1.0 Points
A sample of 20 observations has a standard deviation of 4. The sum of the squared
deviations from the sample mean is:
A.
28
8
B.
30
4
C.
32
0
D.
40
0
Answer Key: B
Question 2 of 20 1.0/ 1.0 Points
Suppose that a histogram of a data set is approximately symmetric and "bell shaped".
Approximately what percent of the observations are within two standard deviations of the
mean?
A.
95
%
B.
68
%
C.
50
%
D.
99.
7%
Answer Key: A
Question 3 of 20 1.0/ 1.0 Points
, Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10?
