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Determining the standard deviation

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The average age of passenger car in use is 7.6 years. For a simple random sample of 34 vehicles in the employees parking lot of a plant, the average age is 9 years with standard deviation of 3.1 years. At 0.01 level of significance, can we conclude that the average age of cars driven to work by employees is greater that the national average? Please show all the formulas used and steps, I would really appreciate it.

Reference no: EM132952173

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