Modules 6-8 Vocabulary Flashcards Preview

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Flashcards in Modules 6-8 Vocabulary Deck (43)
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1

- a measure of the extent to which two variables change together, and thus of how well either variable predicts the other.

Correlation

2

- a statistical index of the relationship between two variables (from -1.0 to +1.0)

Correlation coefficient

3

- a graphed cluster of dots, each of which represents the values of two variables.

Scatterplot

4

- the perception of a relationship where non exists.

*Illusory Correlation

5

- a research method in which an investigator manipulates one or more factors (independent variable) to observe the effect on some behavior or mental process (the dependent variable).

Experiment

6

- in an experiment, the group exposed to the treatment, that is, to one version of the independent variable.

Experimental Group

7

- in an experiment, the group not exposed to the treatment.

Control Group

8

-assigning participants to experimental and control groups by chance, thus minimizing preexisting differences between the different groups.

Random Assignment

9

- an experimental procedure in which both the research participant and the research staff are ignorant (blind) about whether the research participants have received the treatment or a placebo.

Double-blind procedure

10

- an experiment in which the participants are unaware of who received the treatment.

Single-blind procedure

11

- experimental results caused by expectations alone.

Placebo effect

12

- the experimental factor that is manipulated; the variable whose effect is being studied.

Independent Variable

13

- the outcome factor; the variable that may change in response to manipulations of the independent variable.

Dependent Variable

14

- a factor other than the independent variable that might produce an effect in an experiment.

Confounding Variable

15

- the extent to which a test or experiment measures or predicts what it is supposed to.

Validity

16

- numerical data used to measure and describe characteristics of groups.

Descriptive Statistics

17

- a bar graph depicting a frequency distribution.

Histogram

18

- the arithmetic average of a distribution, obtained by adding the scores and then dividing by the number of scores.

Mean

19

- the middle score in a distribution; half the scores are above it and half are below it

Median

20

- the most frequently occurring score in a distribution.

Mode

21

- a representation of scores that lack symmetry around their average value.

Skew

22

- the difference between the highest and lowest scores in a distribution.

Range

23

- a computed measure of how much scores vary around the mean score.

Standard Deviation

24

- a symmetrical, bell-shaped curve that describes the distribution of many types of data.

Normal Curve

25

- numerical data that allow one to generalize- to infer from sample data the probability of something being true of a population.

Inferential Statistics

26

- a statistical statement of how likely it is that an obtained result occurred by chance.

Statistical Significance

27

- exists when one variable decreases as the other variable decreases, or one variable increases while the other increases.

Positive correlation

28

- a relationship between two variables in which one variable increases as the other decreases, and vice versa.

Negative correlation

29

- a measurement of the amount of people who respond to a certain call-to-action.

Response rate

30

- a summary of how often different scores occur within a sample of scores.

Frequency distribution