Section 11: Standard Deviation

Question 1

The standard deviation is based on the differences between the scores in a distribution and their mean.” This statement is true or false

Answer 1

True

Question 2

Which group has a smaller standard deviation?
A. Scores for group 1: 10, 20, 30, 40, 50
B. Scores for group 2: 30, 31, 32, 33, 34

Answer 2

B. Scores for group 2

Question 3

In all participants in a group have the same score, the standard deviation of their scores equals:
A. 1
B. 100
C. Some other value

Answer 3

C. Some other value – 0

Question 4

In a normal distribution, what percentage of the cases lies between one standard deviation unit above the mean and one standard deviation unit below the mean?
A. 34%
B. 50
C. 68%

Answer 4

C. 68%

Question 5

In a normal distribution with a mean of 90.00 and a standard deviation of 10.00, what percentage of the cases lies between scores of 80 to 90?
A. 34%
B. 50%
C. 68%

Answer 5

A. 34% – i don’t know how or why