chi square sample size calculator

one varaince test tutorial

χ² distribution

Normal distribution left tailed Normal distribution two tailed Normal distribution right tailed

Test calculation

Calculates the sample size to gain the required test power and draw a power analysis chart for the following:
Chi-Squared Test For Goodness Of Fit

Statistic Data

digits:example digits=2: (0.001234 => 0.0012)
α:significant level (0-1), maximum chance allowed rejecting H0 while H0 is correct (Type1 Error)
Power:required test power
Effect size(w):0.1 small, 0.3 medium, 0.5 large
df:degrees of freedom

validation message