A set of scores ranges from a high of X = 96 to a low of X = 27. If these scores are placed in a grouped frequency distribution table with an interval width of 10 points, the top interval in the table would be ________.

#

90-99

90-100

91-100

87-96

#

After 5 points are added to every score in a distribution, the mean is calculated and found to be = 30. What was the value of the mean for the original distribution?

Answer

30

cannot be determined from the information given

25

35

A sample of n = 5 scores has a mean of M = 12. What is x for this sample?

Answer

12/5 = 2.40

5(12) = 60

cannot be determined from the information given

5/12 = 0.417

What is the shape of the distribution for the following set of data?

Scores: 1, 1, 1, 2, 3, 3, 3

Answer

a.

positively skewed

negatively skewed

symmetrical

rectangular