The paper ?Trends in Blood Lead Levels and Blood Lead Testing among U.S. Children Aged 1 to 5 Years? (Pediatrics [2009]: e376?e385) gave data on blood lead levels (in mg/dL) for samples of children living in homes that had been classified either at low, medium, or high risk of lead exposure based on when the home was constructed. After using a multiple comparison procedure, the authors reported the following:

1. The difference in mean blood lead level between low-risk housing and medium-risk housing was significant.

2. The difference in mean blood lead level between low-risk housing and high-risk housing was significant.

3. The difference in mean blood lead level between medium-risk housing and high-risk housing was significant.

Which of the following sets of T-K intervals (Set 1, 2, or 3) is consistent with the authors? conclusions? Explain your choice.?

?L = mean blood lead level for children living in low-risk housing

?M = mean blood lead level for children living in medium-risk housing

?H = mean blood lead level for children living in high-risk housing

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Difference Set 2 Set 3 Set 1 (-0.6, 0.1) (-0.6, –0.1) (-1,5, –0.6) (-1.5, –0.6) (-0.9, -0.3) (-0.9, 0.3) (-0.6, -0.1) (-1.5, -0.6) PL — Рм Н, — Ри (-0.9, -0.3) Ри — Ми