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Flashcards in Statistics Deck (10):
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Statistical analysis

Describes data and quantifies relationships between variables.

1

Frequency distribution

An arrangement of data points based on how frequently they occur.

2

Normal distribution

A frequency distribution with a symmetrical bell shaped curve.

3

Central frequency

Measures of the center of the frequency distribution. There are three types:
1. Mode: the most frequent data point
2. Median: the middle data point
3. Mean: the arithmetic average of data points

4

Variability

How the data are dispersed or spread around the mean.

5

Range

The distance between the highest and lowest data point.

6

Standard deviation

The average distance of a data point from the mean. A small SD means the scores are relatively close to the mean score; large SD means the scores have a wider range around the mean.

7

Statistical significance

Means that the differences observed are too big to have occurred by chance.

8

Type I error

Occur in significant testing: false positive; perceives an effect that is not there.

9

Type II error

False negative; fails to perceive an effect that is there.