Unburnt colliery spoil as a medium for plant growth

Reference no: EM131087564

The following data resulted from an experiment to assess the potential of unburnt colliery spoil as a medium for plant growth. The variables are x = acid extractable cations and y = exchangeable acidity/total cation exchange capacity ("Exchangeable Acidity in Unburnt Colliery Spoil," Nature, 1969: 161):

Standardizing the independent variable x to obtain and fitting the regression function yielded the accompanying computer output.

a. Estimate µ_Y.50.

b. Compute the value of the coefficient of multiple determination.

c. What is the estimated regression function using the unstandardized variable x?

d. What is the estimated standard deviation of ß₂ computed in part (c)?

e. Carry out a test using the standardized estimates to decide whether the quadratic term should be retained in the model. Repeat using the unstandardized estimates. Do your conclusions differ?

Reference no: EM131087564

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