Concept explainers
Testing If Daily Sales Obey a Binomial
Records show sales result from 30% of all sales calls. Assuming independent sales calls, the number of sales per day should follow a binomial probability distribution. The binomial probability
For this exercise, assume that the population has a binomial probability distribution with n = 4, p = .30, and x = 0, 1, 2, 3, and 4.
- a. Compute the expected frequencies for x = 0, 1, 2, 3, and 4 by using the binomial probability function. Combine categories if necessary to satisfy the requirement that the expected frequency is five or more for all categories.
- b. Use the goodness of fit test to determine whether the assumption of a binomial probability distribution should be rejected. Use α = .05. Because no parameters of the binomial probability distribution were estimated from the sample data, set the degrees of freedom to k − 1 when k is the number of categories.
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Essentials Of Statistics For Business & Economics
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