3.9 Ball bearing acceptance. Each boldface number in the next paragraph is the value of either a parameter or a statistic. In each case, state which it is.

A carload lot of ball bearings has an average diameter of 2.503 centimeters (cm). This is within the specifications for acceptance of the lot by the purchaser. The inspector happens to inspect 100 bearings from the lot with an average diameter of 2.515 cm. This is outside the specified limits, so the lot is mistakenly rejected.