Percentage body fat cannot be measured directly, so it has to be predicted from a series of skinfold measures. Suppose seven sites were measured (triceps, chest, midauxillary, subscapular, suprailiac, abdominal and thigh). How many participants should be recruited for a multiple regression to be performed?
A) 105
B) 155
C) 85
D) 65

Question

Quizplus · Accepted Answer

A general rule of thumb for multiple regression is to have at least 15 participants per predictor variable. With 7 predictor variables, 7 x 15 = 105 participants are needed.

Percentage Body Fat Cannot Be Measured Directly, So It Has