In an attempt to improve efficiency starbucks has, Ask an Expert

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In an attempt to improve efficiency, Starbucks has implemented "lean" Japanese techniques at m any of its 11,000 U.S. stores (The W all Street Journal, August 4 , 2009). By reducing the time baristas (employees) spend on bending, reaching, and walking, they will have more time to interact with customers and improve the Starbucks experience. Suppose Starbucks adopts the lean technique at Store 1, but makes no changes at Stores 2 and 3. On a recent Monday morning between the hours of 7:00 AM and 8:00 AM, the following statistics were obtained relating to average time per order (in seconds):

953_Japanese techniques.png

Excel produced the following ANOVA table:

1230_ANOVA table.png

a. Compute 95% confidence interval estimates of all paired differences of the means using Fisher's LSD approach.

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

c. Which of these two approaches is more reliable? Explain.

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

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Category:- Statistics and Probability
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