Two-Way ANOVA

Description: The data for this example comes from a behavioral study of performance. The participants are 24 monkeys. Their task is to perform an "oddity" problem. They are shown three objects, e.g., two circles and a square, the odd object has a food reward placed in a small well under the object. The dependent measure (score) is the total number of trials that they select the odd object and get rewarded. There are two independent variables reward (reward) with three levels (1 grape, 3 grapes, or 5 grapes) and drive level (drive) with two levels (1 hour of food deprivation or 24 hours of food deprivation).

Download the SPSS dataset: Monkey.sav

QUESTIONS:

Conduct a two-way ANOVA that compares the mean score for each level of reward combined with each level of drive.

1.Write the appropriate null hypotheses for the 2-way ANOVA.

2.Report and interpret your results - If there is a significant interaction, give a detailed description.