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Card 13 / 21:
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.
Which distribution should you use for this problem? Explain your choice.Define the random variable X ¯ in words.Construct a 95% confidence interval for the population mean cost of a used car. State the confidence interval. Sketch the graph. Calculate the error bound.Explain what a “95% confidence interval” means for this study.
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