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Solution: Two random samples of people, one with low levels of lead in their blood, the other with high levels of lead in their blood, were involved in

Question: Two random samples of people, one with low levels of lead in their blood, the other with high levels of lead in their blood, were involved in a study on the effects of lead. One part of the study had participants take a standard IQ test. Summary statistics for the test results of the two groups are shown in this table.

The data was used to estimate the difference in mean IQ scores for the two populations that yielded the samples. (Tables side-by-side to save vertical space.)

Was the estimate obtained using the 2 -Sample $t$ or paired $t$ procedure? How do you know?
Interpret the interval. What does it tell you about the influence of lead levels in the blood on a person's score on this IQ test?

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Solution: Two random samples of people, one with low levels of lead in their blood, the other with high levels of lead in their blood, were involved in

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