Power Analysis
Test design
One-sample t test
Paired t test
Two-sample t test (equal n per group)
Alternative hypothesis
Two-sided
Greater
Less
Effect size (Cohen's d)
Sample size n
Significance level alpha
Target power
Distribution Explorer
Quantity to compute
Density at x: f(x)
At most: P(X <= x)
At least: P(X >= x)
Between: P(a <= X <= b)
Degrees of freedom
Noncentrality delta
Cutoff x
Bounds [a, b]
Show mean, variance, and median
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Power Analysis
Distribution Explorer