Solve this problem using the same methods and assumptions that you used for Exercise 1.
a. Use the t value you computed to compare the students in the “impossible to solve” condition with those in the “easy to solve” condition in terms of postquiz heart rates (see Computer Exercise 3 of Chapter 7) as your value for δ (delta) to determine the power of that test.
b. Had the population effect size for this DV been medium in size (d = .5), how many students would Ihno have needed to have in each condition to attain power = .7?
Data from exercise 1
Suppose that the students at Bigbrain University are planning to test whether the mean math SAT score for their school is higher than the national average (μ) of 500 (assume that σ = 100). a. If they believe that their mean is 520, and they plan to sample 25 students, what is the power of their statistical test at the .05 level, two-tailed? What would the power be for a one-tailed test? Explain why power is higher for the one tailed test.
