# At the 0.05 level of significance, is there evidence of a difference in the variation in waiting time among the four locations?

10.55Consider an experiment with four groups, with eight values in each. For the ANOVA summary table below, fill in all the missing results:

Source Degrees of Freedom Sum of Squares Mean Square (Variance) F
Among Groups c-1=? SSA=? MSA=80 FSTAT=?
Within Groups n-c=? SSW=560 MSW=?
Total n-1=? SST=?
10.59A hospital conducted a study of the waiting time in its emergency room. The hospital has a main campus and three

Satellite locations. Management had a business objective of reducing waiting time for emergency room cases that did not require immediate attention. To study this, a random sample of 15 emergency room cases that did not require immediate attention at each location were selected on a particular day, and the waiting times (measured from check-in to when the patient was called into the clinic area) were collected and stored inERWaiting.

A.At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations?

B.If appropriate, determine which locations differ in mean waiting time.

C.At the 0.05 level of significance, is there evidence of a difference in the variation in waiting time among the four locations?