John's parents recorded his height at various ages up to 66 months. Below is a record of the results. Age (months) 36 48 54 60 66 Height (inches) 35 38 41 43 45 John's parents decide to use the least-squares regression line of John's height on age to predict his height at age 21 years (252 months). We conclude th such a prediction could be misleading, because it involves extrapolation. All of the answer options are correct. John's height (in inches) should be about half his age (in months). John's parents will get a fairly accurate estimate of his height at age 21 years, because the data are clearly correlated.