Simple regression was employed to establish the effects of childhood exposure to

Question

Simple regression was employed to establish the effects of childhood exposure to lead. The effective sample size was about 122 subjects. The independent variable was the level of dentin lead (parts per million). Below are regressions using various dependent variables.

Calculate the t statistic for each slope. From the p-values, which slopes differ from zero at ? = .01? (Round your answers to 2 decimal places. Negative values should be indicated by a minus sign.)

It would be inappropriate to assume cause and effect without a better understanding of how the study was conducted.

Simple regression was employed to establish the effects of childhood exposure to lead. The effective sample size was about 122 subjects. The independent variable was the level of dentin lead (parts per million). Below are regressions using various dependent variables.

Explanation / Answer

For Test Statistic , Divide Slope by Standard error for each one

Highest grade achieved = -0.034/0.015=-2.27

Similarly for others

-3.00

-0.17

-3.77

3.63

-3.51

1.87

0.91

-0.38

b) No

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