Question: Refer back to the data in Exercise 4, in which y = ammonium concentration (mg/L) and x = transpiration (ml/h). Summary quantities include n =

Refer back to the data in Exercise 4, in which y = ammonium concentration (mg/L) and x = transpiration (ml/h). Summary quantities include n = 13, (xi = 303.7, (yi = 52.8, Sxx = 1585.230769, Sxy = −341.959231, and Syy = 77.270769.
a. Obtain the equation of the estimated regression line and use it to calculate a point prediction of ammonium concentration for a future observation made when ammonium concentration is 25 ml/h.
b. What happens if the estimated regression line is used to calculate a point estimate of true average concentration when transpiration is 45 ml/h? Why does it not make sense to calculate this point estimate?
c. Calculate and interpret s.
d. Do you think the simple linear regression model does a good job of explaining observed variation in concentration? Explain.

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a From the summary provided And So the equation of the least squares regression line is 91010 21572 ... View full answer

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