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The American Hospital Association reports in Hospital Stat that the mean cost to community hos[itals per...

The American Hospital Association reports in Hospital Stat that the mean cost to community hos[itals per patient per day in U.S. hospitals was $931 in 1994. In that same year, a random sample of 30 daily costs in Massachusetts hospitals yielded a mean of $962 and a standard deviation of $223. Do the data provide sufficient evidence to conclude that in 1994 the mean cost in Massachusetts hospitals was higher than the national mean of $931? Perform a hypothesis test at the 5% significance level.

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Hypothesis test :

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