Ten customers per hour were asked by the cashier at Burger King if they liked their meal,
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Question:
Ten customers per hour were asked by the cashier at Burger King if they liked their
meal, and the fraction that said "no" are shown in the table, for a twelve-hour period.
For the data shown above, find
a. Determine the mean sample fraction defective
b. Determing sample standard deviation.
c. The 3-sigma UCL and LCL.
d. Does customer satisfaction at Burger King appear to be in statistical control? How could we improve the analysis?
| Hour | Fraction defective |
| 1 | 0,00 |
| 2 | 0,20 |
| 3 | 0,40 |
| 4 | 0,10 |
| 5 | 0,10 |
| 6 | 0,20 |
| 7 | 0,10 |
| 8 | 0,00 |
| 9 | 0,00 |
| 10 | 0,20 |
| 11 | 0,00 |
| 12 | 0,10 |
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