A researcher wishes to estimate the average blood alcohol concentration (BAC) for drivers involved in fatal accidents who are found to have positive BAC values. He randomly selects records from 82
82 such drivers in 2009 and determines the sample mean BAC to be 0.15
0.15 g/dL with a standard deviation of 0.060
0.060 g/dL. Complete parts (a) through (d) below.
(a) A histogram of blood alcohol concentrations in fatal accidents shows that BACs are highly skewed right. Explain why a large sample size is needed to construct a confidence interval for the mean BAC of fatal crashes with a positive BAC.
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