For fast-food restaurants, the drive-through window is an important revenue source. The fast-food chain that offers the fastest service is likely to attract additional customers. Each year QSR Magazine publishes its results of a survey of drive-through service times at fastfood chains. In a recent year, the mean time was 226.07 seconds for Wendy's, 236.50 seconds for Taco Bell, 193.31 seconds for Burger King, 273.29 seconds for McDonald's, and 218.85 seconds for Chick-fil-A. Suppose the study was based on 20 customers for each fast-food chain. The ANOVA table for this problem is presented below.

Analysis of Variance Table Response: time Df Sum Sq Mean Sq F value Pr( >F) fast-food 4 68, 028.2704 17, 007 .0676 130.2226 0.0090 Residuals 95 12, 407.00 130.60