Chapter 2

Question 1

Frequency distribution

Answer 1

Number of cases observed at each score value

Question 2

Relative frequency distribution

Answer 2

Proportion (like a percentage) of each scores frequency

Question 3

Class interval

Answer 3

Segment of the measurement score that has more than one possible score value (such as a A containing marks between 80-100)

Question 4

Cumulative frequency distribution

Answer 4

The entry for a score value/class interval is the sum of the frequencies for that value plus the frequencies of all lower score values. It’s the total number of frequencies. Frequency of the lowest value + second lowest = second lowests’ cumulative frequency

Question 5

Cumulative relative frequency distribution

Answer 5

The values cumulative frequency divided by the total number of cases

Question 6

Stated limits

Answer 6

Highest and lowest score values in an interval

Question 7

Minimum size of class interval

Answer 7

Range ÷ max # of class intervals from table 2.7

Question 8

Upper/lower real limit

Answer 8

.5 subtracted from the lowest #, and .5 added to the highest #

Question 9

Size of a class interval

Answer 9

Upper real limit - lower real limit

Question 10

Midpoint of a class interval

Answer 10

Middle of an interval’s real limits. (0.5 * interval size) + lower real limit

Question 11

Central tendency

Answer 11

A typical, representive score (often the highest point on a bell curve)

Question 12

Variability

Answer 12

The extent in which a score deviates from the central tendency

Question 13

Skewness

Answer 13

Scores being bunched to one side of the central tendency

Question 14

Kurtosis

Answer 14

Curvedness or peakness of a graph