AP Psychology - 1.6

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17 Terms

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Descriptive Stats

Summarizes and describes numerical data.

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Inferential Stats

Allows generalization and estimates based on sample data.

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Low Variable Observations

More reliable than high variable observations.

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Correlation Data

Indicates if a relationship exists between two variables through scatterplots.

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Correlation Coefficient

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

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Larger Sample Size

Helps ensure observed effects are not due to sampling error.

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Replicated Data

Ensures results are accurate and not a fluke.

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Measures of Central Tendency

Statistical measures that summarize a set of data.

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Mean

The arithmetic average of a data set.

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Median

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

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Mode

The most frequently occurring score in a data set.

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Skewed

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

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Regression Toward the Mean

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

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Measures of Variation

Statistical measures that describe the spread of data.

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Range

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

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Standard Deviation

The amount of variation in relation to the mean score.

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Normal Curve

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