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In a recent sample of 85 used cars sales costs, the sample mean was $6,325 with a standard deviation of $3,153. Assume the underlying distribution

In a recent sample of 85 used cars sales costs, the sample mean was $6,325 with a standard deviation of $3,153. Assume the underlying distribution is approximately normal.

a. Construct a 95% confidence interval for the population mean cost of a used car.(i) State the confidence interval.

b. Sketch the graph.

c. Calculate the error bound.

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