Flashcards in Chapter 3 Deck (21)

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## Inferential Stats

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

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## 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

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## Raw Score

### Ordinary score (before transformations)

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## Normal Distribution

### Frequency distribution that follows a normal curve

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## Normal Curve

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

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## Normal Curve Table

### Table showing percentages of scores associated with the normal curve

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## Population

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

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## Sample

### Scores of the particular group of people studied

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## Why Study Samples & Not Population?

###
Population would be more accurate but not practical

Samples used to make generalizations

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## Method of Sampling

### Random Selection

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## Random Selection

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

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## Population Parameter

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

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## Sample Statistics

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

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## Probability

###
Expected relative frequency of an outcome

The proportion of successful outcomes to all outcomes

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## What is the purpose of most psychological research?

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

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## Outcome

### Result of an experiment

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## Frequency

### How many times something happens

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## Relative Frequency

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

Proportion of times something happens

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## 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

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## 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

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