A quality control manager at a manufacturing facility has taken four samples with four observations each of Samples of Part Diameter in Inches 1 2 3 4 6.3 6.0 5.9 5.8 6.1 5.8 5.8 5.7 5.7 5.8 5.9 5.8 6.3 6.3 5.8 5.8 (a) Compute the mean of each sample. (Round answers to 3 decimal places, e.g. 15.250.) Mean of sample 1 6.1 Mean of sample 2 5.97 Mean of sample 3 5.85 Mean of sample 4 5.77 (b) Compute an estimate of the mean and standard deviation of the sampling distribution. (Round answer. Mean Standard deviation (c) Develop control limits for 3 standard deviations of the product diameter. (Round answers to 2 decimal places, e.g. 15.25.) CL UCL LCL