An experiment was done to look at whether different relaxation techniques could predict sleep quality better than nothing. A sample of 400 participants were randomly allocated to one of four groups: massage, hot bath, reading or nothing. For one month each participant received the same relaxation technique for 30 minutes before going to bed each night. A special device was attached to the participant's wrist that recorded their quality of sleep, providing them with a score out of 100. The outcome was the average quality of sleep score over the course of the month.
- Which test could we use to analyse these data?
A)Regression or ANOVA
B)Regression only
C)ANOVA only
D)Chi-square

Question

An experiment was done to look at whether different relaxation techniques could predict sleep quality better than nothing. A sample of 400 participants were randomly allocated to one of four groups: massage, hot bath, reading or nothing. For one month each participant received the same relaxation technique for 30 minutes before going to bed each night. A special device was attached to the participant's wrist that recorded their quality of sleep, providing them with a score out of 100. The outcome was the average quality of sleep score over the course of the month. 
- Which test could we use to analyse these data?
A)Regression or ANOVA
B)Regression only
C)ANOVA only
D)Chi-square

Quizplus · Accepted Answer

ANOVA (Analysis of Variance) is the appropriate statistical test for comparing the means of more than two groups to see if there is a significant difference between them, which aligns with the objective of comparing the average quality of sleep score across the four groups (massage, hot bath, reading, or nothing). Regression could also be used to predict the sleep quality score based on the type of relaxation technique, treating the type of relaxation technique as a categorical independent variable.

An Experiment Was Done to Look at Whether Different Relaxation