Medium Lead Level High Lead Level 72 n₂ = 11 99 92 X₂ = 89.615 S2 = 10.573 85 84 97 83 92 104 111 91
Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal.
a. The test statistic, t, is
(Round to three decimal places as needed.)
c. Construct a confidence interval suitable for testing the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels.
less thanmu 1 minus mu 2 less than
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