Crawford Industries purchases step-down electrical converters from two suppliers.The converters from the two suppliers appear to have the same average life (measured in hours) but the variability in useful life appears be different for the the two suppliers.In random samples of 9 converters from supplier A and 9 converters from supplier B, the variance in thesample A was 600; the variance in the sample B was 2800.Assume that the life of the converters is normally distributed in each population.Test the hypothesis that the variances of the two populations are equal, using a significance level of 2%.Report the F statistic (F_stat) for the test. A)3.160 B)6.178 C)4.667 D)2.965

Question

Quizplus · Accepted Answer

The F statistic is calculated by dividing the larger variance by the smaller variance. Here, it is 2800 / 600 = 4.667.

Crawford Industries Purchases Step-Down Electrical Converters from Two Suppliers