A bank is studying the average time that it takes 6 of its tellers to serve a customer. Customers line up in the queue and are served by the next available teller. Based on service time for the last 140 customers, the following ANOVA result is obtained. Source DF SS MS F P-value Teller 5 3315.32 663.064 1.508 0.1914 Error 134 58919.1 439.695 Total 139 62234.4 A bank branch manager wondered if the average service times among the tellers are different.
1. What is the null hypothesis?
a. μ1=μ2=...=μ6
b. At least two of the means are different2. At the 10% significance level,
a. We reject the null hypothesis
b. We cannot reject the null hypothesis