A process that is considered to be in control measures an ingredient in ounces. Below are the last 10 samples (each of size n = 5) taken. The population process standard deviation () is 1.36.

Samples:

S 1	S 2	S 3	S 4	S 5	S 6	S 7	S 8	S 9	S 10
11	9	13	10	12	10	10	13	8	10
9	10	9	10	10	10	11	10	8	12
9	10	10	11	9	8	10	8	12	9
9	11	10	10	11	12	8	10	12	8
12	10	9	10	10	9	9	8	9	12

a. What standard deviation of the sample means should you use? [ Select ] [".61", "1.36", "1.27", ".76"]

b. If z = 3, what are the control limits for the mean chart? [ Select ] ["11.34 and 8.17", "12.56 and 9.67", "11.51 and 8.56", "11.82 and 8.18"]

c. Is the process in control? [ Select ] ["no- samples s5 and s7 are out of control", "only 1 data point is out of control, so it is still acceptable", "yes", "cannot determine from the data", "no - samples s3 and s8 are out of control"]