Statistics glossary
Every term from the AP Statistics course, defined in one sentence first and explained in plain English after. Terms link into the full guides and calculators wherever depth helps.
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A
B
C
- Categorical variable
- Census
- Center of a distribution
- Central limit theorem
- Chi-square test
- Cluster sample
- Coefficient of determination (r²)
- Comparative dotplot
- Complement
- Complement rule
- Completely randomized design
- Computer regression output
- Conditional distribution
- Conditional probability
- Confidence interval
- Confidence level
- Confounding variable
- Continuous random variable
- Continuous variable
- Control group
- Convenience sample
- Correlation
- Correlation coefficient
- Count data
- Coverage probability
- Critical value
- Cumulative distribution
- Cumulative relative frequency
D
E
F
G
H
I
J
L
M
N
O
P
Q
R
S
- Sample
- Sample size for a margin of error
- Sample space
- Sampling distribution
- Sampling distribution of the sample mean
- Sampling distribution of the sample proportion
- Sampling error
- Sampling frame
- Sampling variability
- Scatterplot
- Scope of inference
- Segmented bar chart
- Selection bias
- Shape of a distribution
- Side-by-side boxplot
- Significance level
- Simple random sample
- Simulation
- Skewness
- Slope of a regression line
- Spread of a distribution
- Standard deviation
- Standard deviation of a random variable
- Standard deviation of the residuals (s)
- Standard deviation of the sampling distribution
- Standard error
- Standard error of a proportion
- Standard error of the mean
- Standard normal distribution
- Standardized test statistic
- Standardizing
- Statistic
- Statistical significance
- Stemplot
- Stratified random sample
- Sum of squares
- Symmetric distribution
- Systematic sample