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At a local supermarket receiving dock, the number of truck arrivals per day is recorded for 100 days.
(a) Estimate the mean from the sample. (b) Calculate the expected frequencies assuming a Poisson distribution. Show your calculations in a spreadsheet format. (c) Carry out the chi-square test, combining end categories as needed to ensure that all expected frequencies are at least five. Show your degrees of freedom calculation. (d) At α = .05, can you reject the hypothesis that arrivals per day follow a Poisson process? Trucks
Arrivals per Day at a Loading Dock
Number of Arrivals
0 1 2 3 4 5 6 7 Total
Frequency 4 23 28 22 8 9 4 2 100
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