Sample Size Required for Chi Square test: Goodness of fit

Number of groups / levels in the group in your study (r)

Should be > = 2.

Your Guesstimate of observed proportions and expected proportions for each group / level in the group, based on previous studies / pilot study. (total should be 100)

You can enter the guesstimate of observed proportions based on findings of previous studies / pilot study in each cell. (total = 100%)

Confidence Level %

In percentage. Commonly used values are 95, 99 and 90. Should be between 0.01 to 99.99.

Power ( 1 - β)

In Percentage. Should be between 0.001 to 99.999. Common values are 80 % and 90 %

Sample Size Required =

Sample Size Determination

Sample Size Required for Chi Square test: Goodness of fit

This utility can be used to calculate required sample size when your aim is to test whether there is significant difference between given proportions and expected proportions. (Test of significance: Chi-Square test: Goodness of fit).