A researcher wants to study the effects of music and sugar c

A researcher wants to study the effects of music and sugar consumption on a test of attention. He randomly assigns participants to six conditions: sugary drink + music with vocals, sugary drink + music without vocals, sugary drink + no music, non-sugary drink + music with vocals, non-sugary drink with music without vocals and non-sugary drink with no music. He then gives every group a computerized test of attention and measures their accuracy.

He gets the following data (numbers in cells represent individual participants):

Music with vocals

Music without vocals

No Music

sugary drink

70, 80, 90, 100

75, 85, 95, 100

75, 80, 95, 90

Non-sugary drink

30, 40, 50, 50

70, 80, 90, 95

75, 80, 95, 90

What are the two factors? How many levels does each have?

Enter the data and run a two-way ANOVA. First, what are the means for each of the six cells above?

Is the homogeneity of variance assumption met?

Report the F statistic for the main effect of drink type, the F statistics for the main effect of music type, and the F statistic for their interaction. Which are significant?

Look at the graph of the interaction. Interpret the interaction.

Report results in APA style.

Solution