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 the t 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.) EstimatedDependent VariableR2Standard Errortcalculatedp-valueDiffer from 0?SlopeHighest grade achieved0.059-0.0290.0090.002Reading grade equivalent0.114-0.0720.0190.000Class standing0.059-0.0090.0080.263Absence from school0.0782.7001.5500.084Grammatical reasoning0.0690.1850.0790.021Vocabulary0.114-0.2990.0830.000Hand-eye coordination0.0430.0990.0350.005Reaction time0.01610.2009.3400.277Minor antisocial behavior0.040-0.4140.3990.302

The study was employed to establish the effects of childhood exposure to lead.(a) The t-statistic formula is, t=Estimated slopeStandard error The t statistic for each slope is, Dependent Variable Estimated Slope Standard Error tcalculated Highest grade achieved -0.029 0.009 -0.0290.009=-3.11 Reading grade equivalent -0.072 0.019 -0.0720.019=-3.79 Class standing -0.009 0.008 -0.0090.008=-1.13 Absence from school 2.700 1.550 2.7001.550=1.74 Grammatical reasoning 0.185 0.079 0.1850.079=2.34 Vocabulary -0.299 0.083 -0.2990.083=-3.60 Hand-eye coordination 0.099 0.035 0.0990.035=2.83 Reaction time 10.200 9.340 10.2009.340=1.09 Minor antisocial behavior -0.414 0.399 -0.4140.399=-1.04 Thus, the t statistic for each slope is, Dependent Variable Estimated Slope Standard Error tcalculated Highest grade achieved -0.029 0.009 -3.11 Reading grade equivalent -0.072 0.019 -3.79 Class standing -0.009 0.008 -1.13 Absence from school 2.700 1.550 1.74 Grammatical reasoning 0.185 0.079 2.34 Vocabulary -0.299 0.083 -3.60 Hand-eye coordination 0.099 0.035 2.83 Reaction time 10.200 9.340 1.09 Minor antisocial behavior -0.414 0.399 -1.04