12. [0 points] David was comparing the number of vocabulary words children know about transportation at various ages He fil a least-squares regression line to the data, The residual plot and part of the computer printout for the regression are given below Vocab Predictor StDev tallo 1.0 Constant 3.371 1 337 2.52 Agn 21143 0.2321 601 5-09710 R-5q - 95:4% R-54 (051) - 94 3% Age (o) Is a line on appropriate model for these data? Explain (b) What is the equation of the least-squares regression line for predicting the number of words from age? (c) What is the predicted number of words for a child of 7.5 years of age? (d) Interpret the slope of the regression line in the context of the problem. (e) Interpret the value of r in the context of the problem. (n) Interpret the value of s in the context of the