9. The variability of the scores in a sample tends to be ___________ the variability of the scores in the population from which the sample was obtained.

Smaller than

Larger than

Exactly the same as

Unrelated to

10. A population of scores has = 50 and = 10. If 5 points are added to every score in the population, then the new mean and standard deviation would be:

= 50 and = 10

= 55 and = 10

= 50 and = 15

= 55 and = 15

11. A population of N = 10 scores has a mean of = 24 with SS = 160, a variance of ²= 16 and a standard deviation of = 4. For this population, (X - )²has a value of:

0

40

16

160

12. For a normal distribution with = 100 and = 10, what percentage of scores have values less than X = 85?

6.68%

43.32%

93.32%

-6.68%

13. You have a score of X = 65 on an exam with a mean of = 70. Which of the following values for the standard deviation would give you the highest position within the class (i.e., the best score for you)?

= 1

= 5

= 10

Cannot be determined