How large a sample is required in problem 10.20 if the power of the test is to be 0.90 when the true mean is 5.20? Assume that σ = 0.24. Problem 10.20:
A random sample of 64 bags of white cheddar popcorn weighed, on average, 5.23 ounces with a standard deviation of 0.24 ounce. Test the hypothesis that μ = 5.5 ounces against the alternative hypothesis, μ < 5.5 ounces, at the 0.05 level of significance.