On a recent Monday morning betw een the hours of 7:00 AM and 8:00 AM, the following statistics were obtained relating to average time per order (in seconds):

Excel produced the following ANOVA table:

Source of Variation SS d f MS F p-value F crit Between Groups 811.70 2 405.85 52.11 5.5E-12 3.226 Within Groups 319.30 41 7.79 Total 1131.00 43

a. Com pute 95% confidence interval estimates o f all paired differences o f the means using Fisher's LSD approach.

b. Repeat the analysis with Tukey's HSD approach.

c. Which o f these tw o approaches is more reliable? Explain.

d. Does the data suggest that the lean technique is improving efficiency? Explain. P-69