A quality control manager at a manufacturing facility has taken four samples with four observations each of the diameter of a part.

Samples of Part Diameter in Inches

1		2		3		4
6.2		6.2		5.8		6.0
6.0		6.3		6.0		6.3
6.1		5.8		5.8		6.0
5.9		6.3		5.7		5.7

(a) Compute the mean of each sample. (Round answers to 3 decimal places, e.g. 15.250.)

Mean of sample 1
Mean of sample 2
Mean of sample 3
Mean of sample 4

(b) Compute an estimate of the mean and standard deviation of the sampling distribution. (Round answers to 4 decimal places, e.g. 15.2500.)

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