Company ABC manufactures a machine part, which is supposed to weigh 8.3 pounds on average. To check if this requirement

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Company ABC manufactures a machine part, which is supposed to
weigh 8.3 pounds on average. To check if this requirement is met,
16 machine parts are randomly selected from a recent production
run. The average weight of these part is 8.55 pounds, and the
sample standard deviation is 0.23 pounds. Suppose the weights of
the parts are normally distributed. We want to test the hypothesis
that the parts average 8.3 pounds. Calculate the test
statistic.