Simple regression was employed to establish the effects ofchildhood exposure to lead. The effective sample size was about 122subjects. The independent variable was the level of dentin lead(parts per million). Below are regressions using various dependentvariables.
(a) Calculate the t statistic for eachslope, at significance level = 0.01. (Negative valuesshould be indicated by a minus sign. Round your answers to 2decimal places.)
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| Dependent Variable | R2 | Estimated Slope | Std. Error | tcalculated | p-value | Differ from 0? |
| Highest grade achieved | | .061 | | | −0.027 | | | 0.009 | | | | .008 | | (Click to select)  Yes  No |
| Reading grade equivalent | | .121 | | | −0.070 | | | 0.018 | | | | .000 | | (Click to select)  No  Yes |
| Class standing | | .039 | | | −0.006 | | | 0.003 | | | | .048 | | (Click to select)  No  Yes |
| Absence from school | | .071 | | | 4.8 | | | 1.7 | | | | .006 | | (Click to select)  Yes  No |
| Grammatical reasoning | | .051 | | | 0.159 | | | 0.062 | | | | .012 | | (Click to select)  Yes  No |
| Vocabulary | | .108 | | | −0.124 | | | 0.032 | | | | .000 | | (Click to select)  No  Yes |
| Hand-eye coordination | | .043 | | | 0.041 | | | 0.018 | | | | .020 | | (Click to select)  Yes  No |
| Reaction time | | .025 | | | 11.8 | | | 6.66 | | | | .080 | | (Click to select)  Yes  No |
| Minor antisocial behavior | | .025 | | | −0.639 | | | 0.36 | | | | .082 | | (Click to select)  Yes  No |
