Sample size for a test of a mean — size.test.mean • statpsych

Computes the sample size required to test a single population mean with desired power in a 1-group design. Set the variance planning value to the largest value within a plausible range for a conservatively large sample size.

size.test.mean(alpha, pow, var, es)

Arguments

alpha: alpha level for hypothesis test
pow: desired power
var: planning value of response variable variance
es: planning value of mean minus null hypothesis value

Value

Returns the required sample size

Examples

size.test.mean(.05, .9, 80.5, 7)
#>  Sample size
#>           20

# Should return:
# Sample size
#          20