When a manufacturing process is operating properly, the mean length of a certain part is known to be 6.175 inches, and lengths are normally distributed. The standard deviation of this length is 0.0080 inches. If a sample consisting of 6 items taken from current production has a mean length of 6.168 inches, is there evidence at the 5% level of significance that some adjustment of the process is required? Given: mu, o, n, x, 5% level of significance Approach: compare z-values (test statistic z vs critical z1=-1.96); p-values (O (-z1) and 1- 0 (z1) vs 5%); x values (critical x value vs x)

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