A quality specialist has room temperature under statistical process control within control limits of 25 and 27 oC. He collected data comprising 10 samples of size 6 over a period of time and found that the average temperatures of these samples are 26, 26.5, 26.3, 25.8, 26.6, 25.5, 26.7, 25.3, 25.9, and 26.8. Given this, which of the following is a true statement?

Select one:

a. the room temperature is out of statistical process control.

b. the number of samples is insufficient to determine whether the room temperature is or is not in statistical process control.

c. the room temperature is in statistical process control.

d. the given data is insufficient to determine whether the room temperature is under statistical process control.

e. the sample size is too small to determine whether the room temperature is or is not in statistical process control.