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Mathematics 15 Online
OpenStudy (anonymous):

Researchers would like to conduct a study of n healthy adults to detect a four year mean brain volume loss of .01 mm3. Assume that the standard deviation of four year volume loss in this population is .04 mm3. What would be the value of n needded for 90% power of type one error rate of 5% one sided test versus a null hypothesis of no volume loss?

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