Referring to Scenario 4, this is a: A quality assurance inspector periodically e

Question

Referring to Scenario 4, this is a: A quality assurance inspector periodically examines the output of a machine to determine if it is property adjusted When properly adjusted, the machine produces nails having a mean length of 2.000 inches. In addition, the population standard deviation is known and is 0. 070 inches. For a sample of 36 nails, the mean length is 2.025 inches. Assume the population is normally distributed and assume a 0.05 level of significance. Assume Z_crt values of -1.96 and +1.96. The hypotheses are as follows. H_0: mu = 2 (machine is property adjusted) H_1: mu notequalto 2 (machine is not properly adjusted) right-tailed test two-tailed test left-tailed test three-tailed test

Explanation / Answer

Answer: B

That is, two-tail test

Since the Alternative hypothesis having the not equal type then it is called as two tail test.

That is, we don’t know the test is exactly right or left tail test.

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