chapter 4

Question 1

Deviations

Answer 1

The distances between the scores and the mean.

Question 2

dispersion

Answer 2

the amount od variety or heterogeneity in an distribution of scores

Question 3

index of qualitative variations

Answer 3

a measure of dispersion for variables that have been organized into frequency distributions

Question 4

interquartile range

Answer 4

the distance from the third quartile to the first quartile

Question 5

measures of dispersion

Answer 5

Statistics that indicate the amount of variety, or heterogeneity, in a distribution of scores.

Question 6

range

Answer 6

the highest score minus the lowest score

Question 7

standart deviation

Answer 7

The square root of the squared deviations of the scores around the mean, divided by N. The most important and useful descriptive measure of dispersion; s represents the deviation of a sample; s represents the standard deviation of a population.

Question 8

variance

Answer 8

The squared deviations of the scores around the mean divided by N. A measure of dispersion used primarily in inferential statistics and also in correlation and regression techniques; s2 represents the variance of a sample; s2 represents the variance of a population.

Question 9

the index of qualitative variation (IQV)

Answer 9

measure the dispersion available for nominal level variables

iqv is a ratio of the amount of variation 0.00 is no variation 1.00 is the maximum variation

Question 10

range and interquartile range

Answer 10

The range (R) is defined as the distance between the highest and lowest scores in a distribution

The interquartile range (Q) is a kind of range. is the Q = Q3 – Q1 ( q3 is 75% and the is the Q1 25% )