Which table should be used to determine a confidence interval on the mean when standard deviation is NOT known and the sample size is 10?

The value for t, when making a two-tailed paired t test, with samples of 13 and alpha =0.05, is

What order do the following corrective action steps normally take for nonconforming product?
I. Analyze the problem.
II. Assign responsibility.
III. Take preventive action.
IV. Evaluate potential importance.
V. Investigate possible causes.

The existence of a quality control manual at your key supplier means

A process has been experiencing problems lately. The operators charting the process have identified the cause to be due to a change in incoming materials. This problem is