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00 Check my work 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. From the p-values, which slopes differ from zero at a = 01? (Round your answers to 2 13 decimal places. Negative values should be indicated by a minus sign.) 01:30:37 Dependent Variable Estimated Std Slope Error tcalculated p-value Differ from 0? eBook Highest grade achieved 0. 010 -0. 028 0.020 164 No Reading grade equivalent 0. 103 -0. 098 0. 038 011 No eferences Class standing 0. 012 0. 003 0.030 . 921 No Absence from school 0.064 5.400 1. 570 001 es Grammatical reasoning 0. 039 0. 172 0.078 029 No Vocabulary 0. 124 0. 188 0. 052 000 Yes Hand- eye coordination 0. 025 0. 046 0. 026 079 No Reaction time 0. 019 11. 160 7. 150 123 Minor antisocial behavior 0. 033 -0. 304 0. 520 560 (b) It would be inappropriate to assume cause and effect without a better understanding of how the study was conducted. Show