Table : TABLE 8-2. The Ingredients for the Calculation of Statistical Power To calculate statistical power for a z test, we must know several “ingredients” before beginning.
Ingredients for Calculating PowerCounseling Center Study
Mean of population 1 (expected sample mean)M = 6.2
Planned sample sizeN = 9
Mean of population 2μM = μ = 4.6
Standard deviation of the populationσ = 3.12
Standard error (using the planned sample size)