Flashcards in Chapter 5 Glossary Deck (70)

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1

## What is an abscissa?

### The x axis on a graph.

2

## What is the alpha level?

### Type 1 error level (probability of incorrectly rejecting the null hypothesis).

3

## What is the analysis of variance?

### Statistical procedure that analyses mean differences between two or more groups by comparing between-groups and within-group variance.

4

## What is average deviation?

### The average distance from the mean.

5

## What is beta?

### The probability of making a type two error.

6

## What is bimodal?

### A distribution of scores that has two modes.

7

## What is central tendency?

### Average or typical score in a distribution.

8

## What is a coefficient alpha?

### An index of internal consistency reliability.

9

## What is continuous variable?

### Variable that can theoretically take on an infinite number of values.

10

## What is a correlation coefficient?

### Index of the degree of linear relationship between variables.

11

## What is correlation?

### Degree of linear relationship between two or more variables.

12

## What is covary?

### When the values of two or more measures change together.

13

## What is cross-tabulation?

### Procedure that illustrates the relationship between two or more nominal variables. A cross tabulation table shows the frequency of participants who show each particular combination of characteristics.

14

## What is a degree of freedom?

### A statistical concept in which one degree of freedom is lost each time that a population parameter is estimated.

15

## What are descriptive statistics?

### Statistics that summarise and/or describe a sample of scores.

16

## What are effect size?

### Index of the size of the difference between groups, expressed in standard deviation units.

17

## What are frequencies?

### The number of objects or participants that fall into a specified category.

18

## What is frequency distribution?

### Organisational device used to simplify large data sets.

19

## What is a frequency polygon?

### Graph that illustrates a frequency distribution by placing a dot above each possible score at a height that indicates the score's frequency and then connect the dots.

20

## What are graphs?

### A means of presenting data visually.

21

## What are grouped frequency distribution?

### Lists the frequency of scores in equal-size intervals.

22

## What is a histogram?

### A bar graph in which the frequency of scores is represented by the height of the bar.

23

## What are individual differences?

### Natural difference among people.

24

## What are inferiental statistics?

### Statistical procedures that allow us to decide whether the sample data suggest that population difference exist.

25

## What is linear relationship?

### Relationship between the variables that, when plotted in a standard coordinate system, cluster around a straight line.

26

## What is a mean?

### Arithmetic average of scores that should be computed only for score data.

27

## What are measures of central tendency?

### Descriptive statistics that indicate the typical score.

28

## What is median?

### Middle score in a distribution.

29

## What is mode?

### Most frequent score in a distribution.

30