Calculate p-values for z-tests, t-tests, and chi-square tests with step-by-step solutions
Z-test: z = 2.5, two-tailed
The p-value is the probability of observing a test statistic as extreme as, or more extreme than, the observed value, assuming the null hypothesis is true.
Z-test: For large samples or known population variance
T-test: For small samples with unknown variance
Chi-square: For categorical data and goodness-of-fit tests