You conduct a regression to find out the relationship between a mother's weight gain during pregnancy and her baby's birth weight. you find b1 = 0.02 Select all true statements. We know that as the mothers weight gain increases, baby's birth weight increases. We know that as the mothers weight gain increases, baby's birth weight decreases. We would need to do a t-test before determining significance. We doing know the direction of the relationship yet. We know that the regression is significant since b1 is positive