Homework Help: statistic

Posted by HN on Tuesday, December 11, 2012 at 1:28am.

a restaurant that bills its house account monthly is concerned that the average monthly bill exceeds $200 per account. A random sample of twelve account is selected, resulting in a sample mean of $220 and a standard deviation of $12. Use a= 0.05. what is the critical value for this test? show the rejection and non rejection area. calculate the test statistic?

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