A study using the factorial design measures the effect upon hemoglobin levels of four independent variables, each administered randomly and independently. How many distinct groups are there in this factorial design?

Question

Quizplus · Accepted Answer

In a factorial design, the number of distinct groups is determined by multiplying the levels of each independent variable. If there are four independent variables and each is administered independently (assuming each has at least two levels), the minimum number of distinct groups is 2^4 = 16.

A Study Using the Factorial Design Measures the Effect Upon