The original paper needs to be updated.

1. Introduction needs references

2. Intr

The original paper needs to be updated.

1. Introduction needs references

2. Introduction lacks specific objectives

3.Methods

did not completely describe the variables…showing their types,

measurement levels, ect. 4.There needs to be a clear statistical

analysis section that states specifically the statistical analysis you

did. 5.Results do not seem to see any categorical variables summarized.

This part two to add to the paper.

1. For the low blood lead level group of children, is the average blood lead level

greater than the recent CDC threshold of 10 μg /100ml in 1972 as well as in

1973?

a. State the hypotheses.

b. Plot the distribution of blood lead levels in 1972 and 1973 using

histograms.

c. State your decision rule.

d. Report the test statistic, p-value, mean, and 95% CI for the mean BLL

in 1972 and in 1973.

e. Interpret the results and state your conclusions.

2. Are the average blood lead levels different between children who spent the

first 2 years of life within a mile of the smelter as compared to children who

did not in 1972 as well as in 1973?

a. State the hypotheses.

b. Plot distribution of blood lead levels for each group using a boxplot for

1972 and for 1973 data.

c. State your decision rule.

d. Report the test statistics, p-values, means, and 95% CI’s for the

difference between mean blood lead levels of children living near the

smelter during their first 2 years and those who did not in 1972, and in

1973.

e. Interpret the results and state your conclusions.

3. Is there a difference between the 1972 and 1973 average blood lead levels

among the children?

a. State the hypotheses.

b. Plot the distribution of blood lead levels in 1972 and 1973 for each

group using a boxplot.

c. State your decision rule.

d. Report the test statistics, p-values, means, and 95% CI’s for the

average change in blood lead level for each of the two groups of

children.

e. Interpret the results and state your conclusions.