A golf balls manufacturer requires that the weights of its golf balls have a standard deviation that
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Question:
A golf balls manufacturer requires that the weights of its golf balls have a standard deviation that is less or
equal 0.08 ounces. One of the quality control inspectors says that the machines need to be recalibrated because he
believes (claims) the standard deviation of the weighs of the golf balls is more than 0.08 ounces. To test the
machines, he selects a random sample of 50 golf balls off the assembly line and finds that they have a mean weight
of 1.56 ounces and a standard deviation of 0.0806 ounces. At the 0.01 level of significance, test the inspector's
claim.
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