Question

paper gave summary quantities for blood lead level (in micrograms per deciliter) for a sample of whites and a sample of African Americans. Data consistent with the given summary quantities follow: Whites 8.3 0.9 2.9 5.6 5.8 5.4 1.2 1.0 1.4 2.1 1.3 5.3 8.8 6.6 5.2 3.4 2.9 2.7 6.7 3.6 African Americans 4.8 1.4 0.9 10.8 2.4 0.4 5.0 5.4 6.1 2.9 5.0 2.1 7.5 3.4 13.8 1.4 3.5 3.3 14.8 3.7 d) Write a few sentences comparing the blood lead level distributions for the two samples. (Select all that apply.)

The distribution for the African Americans shows a greater range than the distribution for the Whites.

There are two outliers in the data set for the African Americans.

Both distributions seem to be positively skewed.

The distribution for the Whites shows a greater range than the distribution for the African Americans.

The median blood lead level for the African Americans is slightly higher than for the Whites.

The median blood lead level for the African Americans is slightly lower than for the Whites.

Both distributions seem to be negatively skewed.

Answer 1

Descriptive statistics for the samples of Whites and African Americans:

The Dot plots displays for the samples of Whites and African Americans:

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The distribution for the African Americans shows a greater range than the distribution for the Whites.

There are two outliers in the data set for the African Americans.

Both distributions seem to be positively skewed.

The median blood lead level for the African Americans is slightly higher than for the Whites.