Assume that the service time mean suddenly increases by 1.5 minute. What is the number of samples, on average, that is needed to detect this shift? (use n=4 & o=0.75)? Sample 1 4 5 6 8 10 #3 x-bar 5.4 4.2 5.0 4.7 5.8 4.6 | 4.8 5.4 4.7 5.4 2.8 2.6 5.4 1.8 2.1 1.5 2.3 1.6 R 3.0 1.1 3. 2.

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