Chapter 3

Question 1

Bimodal Distribution

Answer 1

When you have 2 modes in a distribution

Question 2

Correlation

Answer 2

Tell us the relationship between two variables, there are 3 types: positive, negative, and zero

Question 3

Correlation Coefficient

Answer 3

When describing the relationship between any 2 variables, this is what you determine

Question 4

Descriptive Statistics

Answer 4

Summarize and describe data

Question 5

Frequency Distribution

Answer 5

Expresses how often a score occurs in a set of data

Question 6

Interval Scale of Measurement

Answer 6

One in which equal differences in scores represent equal differences in amount of the property measured, but with an arbitrary zero point

Question 7

Mean

Answer 7

Mathematical average of the distribution of scores

Question 8

Measures of Central Tendency

Answer 8

Mean, median, mode

Question 9

Median

Answer 9

The middle score in a distribution

Question 10

Mode

Answer 10

The most frequently occurring score in a distribution

Question 11

Multimodal Distribution

Answer 11

If you have 3 or more modes in your distribution

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

Nominal Scale of Measurement

Answer 14

The data are “categorical”

Question 15

Normal Curve

Answer 15

A graphical representation of a normal distribution (bell curve)

Question 16

Normal Distribution

Answer 16

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 extreme

Question 17

Ordinal Scale of Measurement

Answer 17

Involves the rank order system, a scale in which scores indicate only relative amounts or rank order

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

Range

Answer 20

The difference between the high score and the low score in the distribution

Question 21

Ratio Scale of Measurement

Answer 21

Has all the properties of an interval scale with the additional property of zero indicating a total absence of the quality being measured

Question 22

Skewed Distribution

Answer 22

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

Question 23

Standard Deviation

Answer 23

The spread of scores around the mean

Question 24

Variance

Answer 24

A statistical concept that tells you the spread of scores within a distribution

Question 25

Zero Correlation

Answer 25

There is no relationship between the variables

Question 26

What are the three measures of central tendency?

Answer 26

Mean, Median, Mode

Question 27

What are the measures of variance?

Answer 27

Standard deviation

Question 28

What is/are the mode(s) in this data set: 25, 44, 45, 45, 56, 79, 83

Answer 28

45

Question 29

What is/are the mode(s) in this data set: 25, 44, 44, 45, 56, 79, 79, 83

Answer 29

44, 79

Question 30

What is the median in this data set: 25, 44, 45, 56, 79

Answer 30

45

Question 31

What is the median in this data set: 25, 44, 45, 56

Answer 31

44.5

Question 32

What is the mean of this data set: 25, 44, 45, 45, 56, 79

Answer 32

49

Question 33

What is the range of the data set in #7? (above)

Answer 33

54