Ten customers per hour were asked by the cashier at Stanleys Deli if they liked their meal,

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Ten customers per hour were asked by the cashier at Stanley’s Deli if they liked their meal, and the fraction that said “no” are shown below, for a twelve-hour period.


For the data shown above, find

a. P.

b. σP.

c. The 3-sigma UCL and LCL.

d. Does customer satisfaction at Stanley’s appear to be in statistical control? How could we improve the analysis?

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