1. A physiologist has conducted an experiment to evaluate the effect of a synthetic hormone on sexual behavior. Ten male rats were injected with the synthetic hormone, and 10 other male rats received a placebo injection. The animals were then placed in individual housing with a sexually receptive female. The dependent variable was the number of matings over a 20-minute period. The data are shown below:

1. Is their evidence that the hormone produced different sexual behavior than the placebo? Perform the appropriate hypothesis test using an \(\alpha \) of .05. (4 points).
   2. Eysenck conducted a study that investigated whether recall would differ depending on five different memory conditions. The participants were asked to perform one of the techniques listed below during memorization. Fifty participants were randomly assigned to one of the five conditions. The data are presented below.
   Perform the appropriate hypothesis tests using an \(\alpha \) of .05. (4 points)
   Recall Conditions

   Counting	Rhyming	Adjective	Imagery	Intention
   9	7	11	12	10
   8	9	13	11	19
   6	6	8	16	14
   8	6	6	11	5
   10	6	14	9	10
   4	11	11	23	11
   6	6	13	12	14
   5	3	13	10	15
   7	8	10	19	11
   7	7	11	11	11

   
   3. A neuroscientist suspects that low levels of the brain neurotransmitter serotonin may be casually related to aggressive behavior. As a first step toward investigating this hunch, she decided to do a correlative study involving nine rhesus monkeys. The monkeys are observed daily for six months, and the number of aggressive acts are recorded. Serotonin levels in the striatum (a brain region associated with aggression) are also measured once per day for each animal. The number of aggressive acts for each animal is the average for the six months given on a per-day basis. Serotonin levels are also average values over the six month period. The researcher would like to obtain a prediction equation (report it) to use in prediction of aggression with serotonin level as the predictor.
   1. Perform the appropriate analysis and provide a graph that summarizes the
      relationship between the two variables. (4 points)

4. Since muscle tension in the head region has been associated with tension headaches, you reason that if muscle tension could be reduced, perhaps the headaches would decrease or go away altogether. You design an experiment in which nine participants with tension headaches participate. The participants keep daily logs of the number of headaches they experience during a 2-week base-line period. Then you train them to lower their muscle tension in the head region using a biofeedback device. After 6 weeks of training, during which the participants have been successful at maintaining low muscle tension, they again keep a 2- week log of the number of headaches experienced. The following are the number of headaches recorded during each 2-week period.

Is there evidence, using a two-tailed \(\alpha \) of .05, that the training changed the number of tension headaches? (4 points)

5. A group of stroke patients performed a maze task, to assess their cognitive functioning following the stroke. Higher scores indicate improved functioning. The maze task has a known population mean (µ) of 22. Using the data provided below, is there evidence that the performance of stroke patients differed from the general population? If so, how? (4 points)

7.50, 22.36, 13.49, 17.14, 12.70, 20.58, 14.18, 14.80, 20.50, 20.49, 20.21, 15.41, 7.79, 3.78, 9.98, 25.47, 20.99, 19.15, 22.94, 3.08, 21.83, 5.55

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