John's parents recorded his height at various ages up to 66 months. They 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: John's height, in inches, should be about half his age, in months.   that the parents will get a fairly accurate estimate of his height at age 21 years because the data are clearly correlated.   such a prediction could be misleading because it involves extrapolation (predicting beyond the scope of the model).   none of the above.

MATLAB: An Introduction with Applications
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John's parents recorded his height at various ages up to 66 months. They 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:
  • John's height, in inches, should be about half his age, in months.

     

  • that the parents will get a fairly accurate estimate of his height at age 21 years because the data are clearly correlated.

     

  • such a prediction could be misleading because it involves extrapolation (predicting beyond the scope of the model).

     

  • none of the above.
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