Assume you have fit the following cubic polynomial to a set of growth data where X ranged from 6 to 20. Plot the response equation over the interval of the data. Does it appear to have a reasonable...

Plot the response equation over the interval of the data. Does it appear to have a reasonable “growth” form? Demonstrate the sensitivity of the polynomial model to extrapolation by plotting the equation over the interval X = 0 to X = 30.