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March 27, 2015

Homework Help: statistics

Posted by Anonymous on Tuesday, August 2, 2011 at 1:01pm.

The director of an inner-city hospital believes that the average cost per gunshot injury of patients admitted to the hospital’s emergency room is $18,000. A random sample of 9 gunshot injuries had a mean of $17,213 with a standard deviation of $572. Calculate the standardized test statistic and determine whether or not the conclusion of the test refutes the director’s claim. Assume the population is normally distributed and use a significance level of 5%.

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