In each case, say which correlation is higher, and explain briefly. (data are from a longitudinal study of growth.) (a) height at age 4 and height at age 18, height at age 16 and height at age 18. (b) height at age 4 and height at age 18, weight at age 4 and weight at age 18. (c) height and weight at age 4, height and weight at age 18.