An experiment was conducted to look at the positive work-motivation effects of imagery on different people. A group of male staff was compared against a group of female staff. Both groups received presentations of positive images (e.g. cats and bunnies), neutral images (e.g. duvets and light bulbs), and negative images (e.g. corpses and vivisection photographs). Positive work motivation was measured by individual work productivity (high values indicate positive work motivation) both before and after each batch of images. The order in which participants saw the batches of positive, neutral and negative images was randomized to avoid order effects. It was hypothesized that positive images would increase positive work motivation, negative images would reduce motivation and neutral images
would have no effect. Differences between the subject groups (male and female staff) were not expected. What technique should be used to analyse these data?
A. Two-way mixed ANOVA
B. Three-way repeated-measures ANOVA
C. Two-way mixed ANCOVA
D. Three-way mixed ANOVA
Answer: D
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