Chapter 3: Stats

Question 1

Bimodal distribution

Answer 1

2 modes in a distribution

Question 2

Mean

Answer 2

Mathematical average of the distribution of scores

Question 3

Median

Answer 3

Middle score in the distribution

Question 4

Mode

Answer 4

Most frequently occurring score in a distribution

Question 5

Multimodal distribution

Answer 5

2 or 3 more modes in your distribution

Question 6

Frequency distribution

Answer 6

How often a score occurs in a set of data

Question 7

Nominal scale of measurement

Answer 7

The data is categorical. It assigned observations into independent categories and then counting the frequency of occurrence within each of the categories creates a nominal scale.

Question 8

Ordinal scale of measurement

Answer 8

Involves the rank order system.a scale in which the scores index are only relative amounts of rank order. When we discuss rank order in a horse race we are using ordinal data.

Question 9

Interval set of measurement

Answer 9

Equal differences in scores represent equal differences in amount of the property measured.

Question 10

Ratio scale of measurement

Answer 10

All the properties of an interval scale with the additional property of zero indicating the total absence of the quantity being measured.

Question 11

Measures of central tendency

Answer 11

Mean, median, mode

Question 12

Range

Answer 12

Difference between the high score and low score in a distribution range.

Question 13

Variance

Answer 13

Statistical concept that tells you the spread of scores within a distribution.

Question 14

Standard deviation

Answer 14

Calculated by taking the square root of the variance

Question 15

Normal distribution

Answer 15

Arrangement of a data set in which most values cluster in the middle of the range and tapper odd symmetrically toward either extreme.

Question 16

Normal curve

Answer 16

A graphical representation of a normal distribution

Question 17

Skewed distribution

Answer 17

Majority of scores fall in either the high or low end not middle

Question 18

Positively skewed distribution

Answer 18

Most of the scores fall below the mean

Question 19

Negatively skewed distribution

Answer 19

More scores fall above mean

Question 20

Correlations

Answer 20

Tell us the relationship between two variables

Question 21

Positive correlation

Answer 21

Variables are said to be positively correlate when a high score on one is accompanied by a high sore on the other (direct relationship)

Question 22

Negative correlation

Answer 22

High score on one is accompanied by low score on the other. An inverse relationship.

Question 23

Zero correlation

Answer 23

No relationship between variables.

Question 24

Correlation coefficient

Answer 24

Describing the relationship between any two variables

Question 25

3 measures of central tendency

Answer 25

Mode median and mean

Question 26

Measures of variance

Answer 26

Standard deviation and range

Question 27

Mode in this data set: 25,44,45,56,79,83, 45

Answer 27

45

Question 28

What is the mode: 25, 44,44,45,56,79,79,83

Answer 28

44 and 79

Question 29

Median in this data set: 25,44,45,56

Answer 29

44.5

Question 30

Median in this data set: 25,44,45,56,79

Answer 30

45

Question 31

Mean of this data set:25,44,45,45,56,59

Answer 31

49