# Poison Goodness fit : Chi square test

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

https://brainmass.com/statistics/chi-squared-test/poison-goodness-fit-chi-square-test-248209

#### Solution Summary

The solution provides step by step method for the calculation of goodness fit statistics for chi square test. Formula for the calculation and Interpretations of the results are also included.