A textile fiber manufacturer is investigating a new drapery yarn, which the comp

Question

A textile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. The company wishes to test the hypothesis Upper H0 mu equals 12 against H1:mu less-than 12 using a random sample of n specimens. Find the boundary of the critical region if the type I error probability

Is there evidence to support the claim that battery life exceeds 40 hours? Use ? = 0.005. ANSWER= is not

b) What is the ?-error for the test in part (a) if the true mean life is 42 hours?

C) What sample size would be required to ensure that ? does not exceed 0.1 if the true mean life is 44 hours?
Round your answers to three significant digits.

Explanation / Answer

Step 1 The parameter of interest is the thread elongation

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