A marketing firm needs to replace its existing network provider and is considering three different providers. A primary consideration is the amount of system downtime. The following table contains the amount of network downtime (in hours) for the last five months for each network provider. At the 5% significance level, the critical value is ________.
A) 4.605
B) 5.991
C) 7.378
D) 9.21

Question

A marketing firm needs to replace its existing network provider and is considering three different providers. A primary consideration is the amount of system downtime. The following table contains the amount of network downtime (in hours) for the last five months for each network provider.  At the 5% significance level, the critical value is ________.
A) 4.605 
B) 5.991 
C) 7.378 
D) 9.21

Quizplus · Accepted Answer

Since we are testing the differences in means between three different providers, we need to use ANOVA. The critical value for a 5% significance level with df = (3-1, 15-3) = (2,12) is 5.991. Therefore, the answer is B.

We cannot determine the best choice(s) based solely on the amount of system downtime without additional information about the providers' other features, such as cost, reliability, customer service, etc.

A Marketing Firm Needs to Replace Its Existing Network Provider