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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.