Question: Imagine a researcher wanted to assess people’s fear of dogs as a function of the size of the dog. He assessed fear among people who indicate they were afraid of dogs, using a 30-point scale from 0 (no fear) to 30 (extreme fear). The researcher exposed each participant to three

different dogs, a small dog that weighed 20 pounds, a medium-sized dog weighing 55 pounds, and a large dog weighing 110 pounds, assessing the fear level after each exposure. Here are some hypothetical data; note that these are the data from Exercises 11.39 through 11.43, on which you have already calculated several statistics:

1. State your null and research hypotheses.
2. Consider whether the assumptions of random selection and order effects were met.
3. In Exercise 11.42, you calculated the effect size for these data. Interpret what this statistic tells us.

Person1 2 3 4

Small dog 7 16 3 9

Medium dog 15 18 18 13

Large dog 22 28 26 29

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