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. (a) Calculate thet statistic for each slope, at significance level = 0.01. (Round your answers to 2 decimal places. Negative values should be indicated by a minus sign.) DepemIen! variable n2 E5233?\" Highest grade achieved 0.049 -0.035 Reading grade equivalent 0.102 0.030 Class standing 0.022 0.00Ei Absence from school 0.053 1.800 Grammatical reasoning 0.046 0.159 Vocabulary 0.143 0.319 Hand-eye coordination 0.033 0.043 Reaction time 0.020 10.800 Minor antisocial behavior 0.026 -0.800