Two way ANOVA + Introduction to repeated measures ANOVA

Which of the following best describes the purpose of a Two-Way ANOVA?

• To test the effect of one independent variable on a dependent variable.

• To test the effect of two independent variables and their interaction on a dependent variable.

• To compare the means of more than three groups when they are independent.

• To measure changes over time within the same group of participants.

The ____ effect in Two-Way ANOVA examines how one independent variable influences the dependent variable, ignoring the other independent variable.

If you hypothesize that the effect of diet on self-esteem depends on the quality of interpersonal relationships, you are investigating the ___________ effect.

In a Two-Way ANOVA, what does an interaction effect represent?

• The combined effect of the two independent variables on the dependent variable.

• The main effect of one independent variable.

• The main effect of one dependent variable.

• The combined effect of the two dependent variables on the independent variable.

Which scenario would require a Two-Way ANOVA?

• Testing if study hours alone predict exam scores.

• Comparing mental health scores among heavy, moderate, and light social media users.

• Analyzing whether exam scores differ based on study hours (low/high) and sleep quality (good/poor).

• Measuring stress levels in participants before and after taking an exam.

If sleep quality were a person, it would be saying: "Both diet and stress are messing with me. Why can’t you just run a __________ ANOVA to understand my struggles?

• one-way

• two-way

• repeated-measures

• multivariate

When analyzing whether sleep (good/poor) and diet (good/poor) affect mood, the dependent variable is ____.

You want to study whether cats' napping habits depend on type of music (classical vs. jazz) and presence of humans (home alone vs. home with owner). What kind of ANOVA should you use, and what are the two independent variables?

Answer explanation

Two-Way ANOVA.

Independent variables are "type of music" and "presence of humans".

Highlight in the table the areas you focus on when interpreting two-way ANOVA results.

In a paired samples t-test, we compare the means of two related measurements taken from the same participants (e.g., their performance before and after a training program). True of False?

• True

• Flase