3. In a process that manufactures tungsten-coated silicon wafers, the target resis- tance for a wafer is 85 m. In a simple random sample of 55 wafers, the sample mean resistance was 84.7 m2, and the standard deviation was 0.5 m. Let represent the mean resistance of the wafers manufactured by this process. A quality engineer tests Ho = 85 (a) Find the p-value (always two-sided). (b) Do you believe it is plausible that the mean is on target, or are you convinced that the mean is not on target? Explain your reasoning. (c) Is it possible to show that the mean is exactly on target? Explain.