To Perform Diagnostics on the Consistency of a Laboratory Scale

Multiple Choice

To perform diagnostics on the consistency of a laboratory scale, multiple measurements are taken using a reference weight over the course of several days.The variance observed over 20 repeated measures is 248.What is a 99% confidence interval for the measurement variance of this scale?

A) (122.129, 688.486)
B) (11.051, 26.239)
C) (117.809, 633.862)
D) (174.034, 413.213)