Arbon Computer Corporation (ACC) produces a popular PC clone. The sales manager for ACC has recently read a report that indicated that sales per sales representative for other producers are normally distributed with a mean of $255,000. She is interested in knowing whether her sales staff is comparable. She picked a random sample of 16 salespeople and obtained the following results:

At a 5 percent significance level, can you reject the null hypothesis that ACC's mean sales per salesperson was $255,000? Draw a diagram that illustrates your answer.

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