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112 In a recent sample of 84 used car sales costs the sample mean was...

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112 In a recent sample of 84 used car sales costs the sample mean was 6 425 with a standard deviation of 3 156 Assume the underlying distribution is approximately normal a Which distribution should you use for this problem Explain your choice b Define the random variable X in words c Construct a 95 percent confidence interval for the population mean cost of a used car i State the confidence interval ii Sketch the graph iii Calculate the error bound al moons for this study

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