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If H0 : = 200 is to be tested against H1 : < 200 at the = 0.10 level of significance based on a random

If H0 : = 200 is to be tested against H1 : < 200 at the = 0.10 level of significance based on a random sample of size n from a normal distribution where = 15.0, what is the smallest value for n that will make the power equal to at least 0.75 when = 197?

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