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timer Asked: May 12th, 2015

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The average cost of owning and operation an automobile is $8121 per 15,000 miles including fixed and variable costs.  A random survey of 40 automobile owners revealed an average cost of $8350 with a population standard deviation of $750.  Is there sufficient evidence to conclude that the average is greater than 8121? Use o= 0.05  

Use 5 step hypothesis

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