A scientist was interested in the success of a newly developed sleep aid called 'Night Owl' on time taken to fall asleep and quality of sleep. She recruited 30 participants who were randomly allocated to receive either a dose of Night Owl or a placebo. The scientist measured the mean time taken for each participant to fall asleep (minutes) and the quality of their sleep (measured on a scale of 1 (poorest quality) to 10 (best possible quality)) over the course of one week.
-How could the scientist analyse her data to investigate whether participants in the Night Owl group fell asleep faster and had a better quality of sleep than those in the placebo group?
A)Factor analysis
B)MANOVA
C)Two-way independent ANOVA
D)One-way Independent ANOVA

Question

A scientist was interested in the success of a newly developed sleep aid called 'Night Owl' on time taken to fall asleep and quality of sleep. She recruited 30 participants who were randomly allocated to receive either a dose of Night Owl or a placebo. The scientist measured the mean time taken for each participant to fall asleep (minutes) and the quality of their sleep (measured on a scale of 1 (poorest quality) to 10 (best possible quality)) over the course of one week. 
-How could the scientist analyse her data to investigate whether participants in the Night Owl group fell asleep faster and had a better quality of sleep than those in the placebo group?
A)Factor analysis
B)MANOVA
C)Two-way independent ANOVA
D)One-way Independent ANOVA

Quizplus · Accepted Answer

MANOVA (Multivariate Analysis of Variance) is appropriate here because the scientist is investigating the effects of a single independent variable (treatment group: Night Owl vs. placebo) on two dependent variables (time taken to fall asleep and quality of sleep). This allows for the analysis of the effect of the treatment on both outcomes simultaneously, considering the potential correlation between them.

A Scientist Was Interested in the Success of a Newly