In a process that manufactures tungsten-coated silicon wafers, the target resistance for a wafer is 86 m(omega). In a simple random sample of 50 wafers, the sample mean resistance was 84.8 mu(omega), and the standard deviation was 0.5 m(omega). Let mu represent the mean resistance of the wafers manufactured by this process. A quality engineer tests Hsub0: mu = 85 versus Hsub1: mu does not = 85.
a. Find the P-values
b. Do you believe it is possible that the mean is on target, or are you convinced that the mean is not on target? Explain your reasoning.