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. your answers to 2 decimal places.} Dependent Variabie 8'2 Estimated Slope Std. Error tcaLculated p untrue 01'. r ran 0.' Highest grade achieved .051 8.02? 8.809 .008 Yes Reading grade equivalent .121 8 . 0?0 8.818 .088 Yes Class standing .039 8.005 8.803 .048 No Absence 'From school .07'1 4.8 1.7 .006 Yes Grammatical reasoning .051 8.159 8.862 .012 Yes Vocabulary .108 8.124 8.832 .008 No Handeye coordination .043 8.041 8.818 .028 Yes Reaction time .025 11.8 6. 66 .088 N0 Minor antisocial behavior .025 8.639' 8.36 .082 Yes lb} It would be inappropriate to assume cause and effect without a better understanding of how the study was conducted