Question

A quality control supervisor for an automobile manufacturer is concerned with uniformity in the number of defects in cars coming off the assembly line. If one assembly line has significantly more variability in the number of defects, then changes have to be made. The supervisor has collected the data below.   Does assembly line B have significantly more variability in the number of defects? Test at the 0.05 significance level.

	Number of Defects
	Assembly Line A	Assembly Line B
Mean	10	11
Variance	9	25
Sample size	20	16

Answer 1