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. to] Calculate the rstatistic for each slope, at signicance level = 0.01. (Negative values should be indicated by a minus sign. Round your answers to 2 decimal places} Dependent Variabie R2 Estimated Slope Std. Error tcaLcuLated puaiue Highest grade achieved .661 8.623'r 8.869 .683 Reading grade equivalent .121 8.67'8 8.818 .688 Class standing .639 8.666 8.863 .648 Absence from school .6?1 4.8 1.? .686 Grammatical reasoning .651 8.159 8.852 .612 Vocabulary .168 8.124 8.832 .688 Hand-eye coordination .643 8.641 8.818 .628 Reaction time .925 11.8 5.55 .688 Click to seleci}v Minor antisocial behavior .925 43.539 9.35 .682 Click to seleci}v lb} It would be inappropriate to assume cause and effect without a better understanding of how the study was conducted. 0 No 0 Yes