A machine produces circular bolts and, as a quality control test, 250 bolts were selected randomly and the diameter of their heads measured as follows:

A machine produces circular bolts and, as a quality control test, 250 bolts were selected randomly and
the diameter of their heads measured as follows:

Required:
Determine whether the customer is getting reasonable value if the label on the circular bolt advertises
that the average diameter of the head is 0.97642 cm.

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The data ensuring continuity and to assist in calculation of the mean is as follows

From normal distribution tables z at 5% significance level (two tiled test) is 1.96. Since calculated z is
less than z 5% then H0 is accepted. That means the customer is getting reasonable value when the
diameter is indicated to be 0.97642.

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Mutiso answered the question on December 6, 2018 at 08:26

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