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 calculation 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 = 0.05, can you reject the hypothesis that arrivals per day follow a Poisson a Process?