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Calculates the test power based on the sample size and draw the power analysis chart.

Use this calculator for one of the following tests:

Goodness of fit test calculator

Degrees of freedom - the number of categories minus one.

Sample size - the total number of observations across the categories.

Chi-Squared test For variance calculator

Degrees of freedom - the total number of observations minus one.

Sample size - the total number of observations.

The following R code should produce the same results