Statistical Calculator

Descriptive Statistics

Calculate mean, median, mode, standard deviation, and variance

T-Test

One-sample and two-sample t-tests for comparing means

Chi-Square Test

Test for independence and goodness of fit

Correlation

Pearson and Spearman correlation coefficients

ANOVA

Analysis of variance for comparing multiple groups

Sample Size

Calculate required sample size for your study

When to Use T-Test

• Comparing means between groups
• Small sample sizes (n < 30)
• Normally distributed data
• Continuous outcome variables

When to Use Chi-Square

• Categorical data analysis
• Testing independence
• Goodness of fit tests
• Expected frequencies ≥ 5

When to Use ANOVA

• Comparing 3+ groups
• Normally distributed data
• Equal variances
• Independent observations

When to Use Correlation

• Measuring relationship strength
• Continuous variables
• Linear relationships
• No causation claims