Suppose that the laboratory referred to in Exercise 8.7 decided not to run one group and compare

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Suppose that the laboratory referred to in Exercise 8.7 decided not to run one group and compare it against , but instead to run two groups (one with and one without lesions). They still expect the same degree of difference.

a. How many subjects do they need (overall) if they are to have power 5 .60?

b. How many subjects do they need (overall) if they are to have power 5 .90?

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