Discussion:
Q: 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 a = .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