A nutritionist conducted an experiment on memory for dreams. She wanted to test whether it really was true that eating cheese before going to bed made you have bad dreams. Over three nights, the nutritionist fed people different foods before bed. On one night they had nothing to eat, a second night they had a big plate of cheese, and the third night they had another dairy product, milk, before bed. All people were given all foods at some point over the three nights. The nutritionist measured heart rate during dreams as an index of distress. How should these data be analysed?
A) One-way independent ANOVA
B) One-way repeated measures ANOVA
C) Three-way repeated measures ANOVA
D) Three-way independent ANOVA

Question

Quizplus · Accepted Answer

The best choice for analyzing this data is a one-way repeated measures ANOVA. This is because the nutritionist gave each participant all three treatments (nothing, cheese, milk) and measured their heart rate during each of the three nights. Therefore, it is a repeated measures design with one independent variable (food type). A one-way independent ANOVA would be inappropriate as the participants are not independent; each participant serves as their own control. A three-way repeated measures or independent ANOVA is not necessary as there is only one independent variable being tested (food type).

A Nutritionist Conducted an Experiment on Memory for Dreams