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Flashcards in Chapter 3 Deck (21)
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1

Inferential Stats

Used to make more general conclusions about the theoretical principle or procedure being studied

2

Z Score

Number of standard deviations that a score is above or below the mean of its distribution
How much it is above or below the average

3

Raw Score

Ordinary score (before transformations)

4

Normal Distribution

Frequency distribution that follows a normal curve

5

Normal Curve

Specific, mathematically defined, bell-shaped frequency distribution that is symmetrical and unimodal

6

Normal Curve Table

Table showing percentages of scores associated with the normal curve

7

Population

Entire group of people to which a researcher intends the result of a study to apply

8

Sample

Scores of the particular group of people studied

9

Why Study Samples & Not Population?

Population would be more accurate but not practical
Samples used to make generalizations

10

Method of Sampling

Random Selection

11

Random Selection

Uses truly random procedures usually meaning that each person in population has an equal chance of being selected

12

Population Parameter

Actual value of the mean, standard deviation, for the population

13

Sample Statistics

Descriptive statistics, such as the mean or standard deviation, figured from the scores in a group of people studied

14

Probability

Expected relative frequency of an outcome
The proportion of successful outcomes to all outcomes

15

What is the purpose of most psychological research?

To examine the truth of a theory or the effectiveness of a procedure

16

Outcome

Result of an experiment

17

Frequency

How many times something happens

18

Relative Frequency

Number of times something happens relative to the number of times it could have happened
Proportion of times something happens

19

Expected Relative Frequency

Number of successful outcomes divided by the number of total outcomes you would expect to get if you repeated an experiment a large number of times

20

Long-Run Relative-Frequency Interpretation of Probability

Understanding of probability as the proportion of a particular outcome that you would get if the experiment were repeated many times

21

Subjective Interpretation of Probability

Way of understanding probability as the degree of one's certainty that a particular outcome will occur