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Question

Sami Schmitt believes that number of cars arriving at his Scrub and Shine Car Wash follow a Poisson distribution. He collected a random sample and constructed the following frequency distribution to test his hypothesis.
Cars per 15 minute interval 0 1 2 3 4 >5
Observed Frequency 5 15 17 12 10 8

Using a= 0.05, the critical value of chi-square for this goodness-of-fit test is ____.
a) 9.49
b) 7.81
c) 7.78
d) 11.07
e) 12.77

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