A pediatrician is studying weight gain in infants. He divides them into 2 groups: breast fed and bottle fed. Further, he divides them into those whose mothers feed them on a timed schedule, and those whose mothers feed them when they cry (on demand). Weight gain is the dependent measure. What type of analysis should you run?
A) a regression
B) a one-way ANOVA
C) a 2 × 2 factorial ANOVA
D) a 2 × 2 correlation

Question

Quizplus · Accepted Answer

A 2 × 2 factorial ANOVA is the best choice because there are 2 independent variables (breast/bottle feeding and timed/on demand feeding) with 2 levels each, and the dependent variable is weight gain. This design allows for the examination of both main effects (the effect of each independent variable separately) and the interaction effect (the combined effect of the independent variables).

A Pediatrician Is Studying Weight Gain in Infants