A Small,independent Amusement Park Collects Data on the Number of Cars

question 128

Essay

A small,independent amusement park collects data on the number of cars with out-of-state license plates.The sample size is fixed at n = 25 each day.Data from the previous 10 days indicate the following number of out-of-state license plates:
(a)Calculate the overall proportion of "tourists" (cars with out-of-state plates)and the standard deviation of proportions.
(b)Using ± 3σ limits,calculate the LCL and UCL for these data.
(c)Is the process under control? Explain.

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