Chapter 3

Question 1

Biomodal distribution

Answer 1

When you have two modes in a distribution, it is referred to as a biomodal distribution.

Question 2

correlation

Answer 2

Correlations tell us the relationship between two variables

Question 3

Descriptive statistics

Answer 3

are brief descriptive coefficients that summarize a given data set, which can be either a representation of the entire or a sample of a population. Descriptive statistics are broken down into measures of central tendency and measures of variability (spread)

Question 4

Correlation coefficient

Answer 4

is a numerical measure of some type of correlation, meaning a statistical relationship between two variables.

Question 5

frequency distribution

Answer 5

is an overview of all distinct values in some variable and the number of times they occur. That is, a frequency distribution tells how frequencies are distributed over values.

Question 6

mean

Answer 6

is the mathematical average of the distribution of scores.

Question 7

measures of central tendency

Answer 7

includes set of scores which are mean, median, and mode.

Question 8

median

Answer 8

the middle score in a distribution

Question 9

mode

Answer 9

most frequently occurring score in a distribution

Question 10

multimodal distribution

Answer 10

if you have 3 or more modes in your distribution

Question 11

Ordinal scale of measurement

Answer 11

Involves the rank order system.

Question 12

negative correlation

Answer 12

when a high score on one is accompanied by a low score on the other

Question 13

Negatively skewed distribution

Answer 13

more of the scores fall above the mean.

Question 14

Normal distribution

Answer 14

is an arrangement of a data set in which most values cluster in the middle of the range and the rest taper off symmetrically toward either extremes.

Question 15

Range

Answer 15

of a distribution is the difference between the high score and the low score in the distribution .

Question 16

Skewed distribution

Answer 16

is one in which the majority of scores fall at either the high or low end rather than the middle of a distribution.

Question 17

Standard deviation

Answer 17

is the spread of scores around the mean

Question 18

Positive correlation

Answer 18

when a high score on one is accompanied by a high score on the other

Question 19

Positively skewed distribution

Answer 19

more of the scores fall below the mean

Question 20

Zero correlation

Answer 20

suggests that the correlation statistic did not indicate a relationship between the two variables.