AP Psychology - 1.6

Descriptive Stats

Summarizes and describes numerical data.

Inferential Stats

Allows generalization and estimates based on sample data.

Low Variable Observations

More reliable than high variable observations.

Correlation Data

Indicates if a relationship exists between two variables through scatterplots.

Correlation Coefficient

Numerical measure of the strength of two variables, ranging from -1 to 1.

Larger Sample Size

Helps ensure observed effects are not due to sampling error.

Replicated Data

Ensures results are accurate and not a fluke.

Measures of Central Tendency

Statistical measures that summarize a set of data.

Mean

The arithmetic average of a data set.

Median

The midpoint or halfway point in a data set (50th percentile).

Mode

The most frequently occurring score in a data set.

Skewed

A representation of scores that is lopsided due to extreme values.

Regression Toward the Mean

Reduces the influence of random factors as more data is collected.

Measures of Variation

Statistical measures that describe the spread of data.

Range

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

Standard Deviation

The amount of variation in relation to the mean score.

Normal Curve

A bell-shaped curve representing a normal distribution of scores.