UCLA Stats Calculator

UCLA Stats Calculator

Normal Distribution
t-Distribution
Chi-square Distribution
One Proportion
One Mean
Difference Two Proportions
Difference Two Means
Citation

Select Mode:

Mean

Standard Deviation

Select Range:

Above

Below

Between

Outside

Symmetric Thresholds

Desired Probability

Probability

Standard Normal Overlay

Select Mode:

Degrees of Freedom (n - 1)

Select Range:

Above

Below

Between

Outside

Symmetric Thresholds

Desired Probability

Probability

Select Mode:

Degrees of Freedom

Select Range:

Above

Below

Desired Probability

Confidence Interval

Test

Confidence Level:

Select the type of test:

Two-sided

Left-tailed

Right-tailed

Hypothesized proportion (p₀)

Sample Size (n)

Sample proportion (p̂)

Number of successes (x)

Use number of successes instead

Confidence Interval

Test

Confidence Level:

Select the type of test:

Two‑sided

Left‑tailed

Right‑tailed

Hypothesized mean (μ₀)

Sample size (n)

Sample mean(x̄)

Sample SD (s)

Confidence Interval

Test

Confidence Level:

Select the type of test:

Two‑sided

Left-tailed

Right-tailed

Group 1

Sample size (n₁)

Sample proportion (p̂₁)

Number of successes (x₁)

Use first number of successes instead

Group 2

Sample size (n₂)

Sample proportion (p̂₂)

Number of successes (x₂)

Use second number of successes instead

Confidence Interval

Test

Assume equal variances

Confidence Level:

Select the type of test:

Two-sided

Left-tailed

Right-tailed

Group 1

Sample size (n₁)

Sample mean (x̄₁)

Sample SD (s₁)

Group 2

Sample size (n₂)

Sample mean (x̄₂)

Sample SD (s₂)

This computes a t-test for the difference between two means for independent (i.e., unpaired) samples. To compute a t-test for two paired samples, use the One Mean tab and plug in μ_diff for μ₀, x̄_diff for x̄, and s_diff for s.