Chapter 5, Problem 72E

a.

To determine

Explain whether the proportion of plots where lichen is common, becomes larger or smaller with increase in elevation, using the aspects of the given table.

b.

To determine

Find the value of $y^{\prime }=\ln \left(\frac{p}{1-p}\right)$ for each elevation.

Fit a regression line of the form $y^{\prime }=a+b\left(\text{Elevation}\right)$.

c.

To determine

Predict the proportion of plots where lichen is common, for an elevation of 900 m.