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2. Joe believes the mean number of customer complaints at all Pagliacci Pizza locations in Seattle is fewer than 15 per business day. To test

2. Joe believes the mean number of customer complaints at all Pagliacci Pizza locations in Seattle is fewer than 15 per business day. To test Joe's belief, you select a random sample of business days. If the calculated value of the associated test statistic equals - -1.50, and the sample data reveal a mean of 14.25 complaints per business day and a standard deviation of 4.5 complaints per business day, how many business days are in the sample? (SHOW WORK; 1 point.)

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