Question

An experiment was done to look at the positive arousing effects of imagery on different people. A sample of statistics lecturers was compared against a group of students. Both groups received presentations of positive images(e.g., cats and bunnies0, neutral images (e.g., duvets and light bulbs), and negative images (e.g., corpses and vivisection photographs). Positive arousal was measured physiologically (high values indicate positive arousal) both before and after each batch of images. The order in which participants saw the batches of positive, negative images was randomized to avoid order effects. It was hypothesized that positive images would increase positive arousal, negative images would reduce positive arousal and the neutral images would have no effect. Differences between the subject group (lecturers and students) were not expected. What technique should be used to analyse these data?

Answer 1

Answer: Three factor repeated measures ANOVA analysis (Three way mixed ANOVA)

Explanation: Here we are comparing three independent variables,

People type (statistic lectures and students)

Imagery type (positive, neutral and negative imagery)

repeated measure: Before and After images shown

and measuring the dependent variable positive arousal as shown in the table below,

		statistics lecturers	students
Positive images	Before
	After
Neutral images	Before
	After
Negative images	Before
	After

Hence there should be performed a three factor repeated measures ANOVA analysis