Question
On a standardized spatial skills task, data reveal that in the population, people have a mean of 15 correct solutions. A psychologist tests a sample
On a standardized spatial skills task, data reveal that in the population, people have a mean of 15 correct solutions. A psychologist tests a sample of 7 people who have brain injuries in the right cerebral hemisphere and finds that they have a Sample Mean of 13.71 and a Sum of Squares of 73. Use the one sample t-test to determine whether righthemisphere damage results in significantly reduced performance on the spatial skills task.
1. Using symbols, state the null and alternative hypotheses.
2. Assuming α = .05, what critical value should be used to test the hypothesis that people with right hemisphere damage have reduced performance on the spatial skills task?
3. Calculate the one-sample t-statistic.
4. What decision should the researcher make about the null hypothesis?
5. What conclusion should the researcher reach about the effect of right hemisphere damage on spatial skills?
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