Statement of a problem № m310


A new curve has been developed for a certain type of cement that results in a compressive strength of 5000 kilograms per square centimeter and a standard deviation of 120. To test the hypothesis that μ = 5000 against the alternative that p < 5000, a random sample of 50 pieces of cement is tested. The critical region is defined to be x < 4970. (a) Find the probability of committing a type error when H n is true. (b) Evaluate 0 for the alternatives p = 4970 and p = 1960.

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