A number of studies have shown lichens (certain plants composed of an alga and a

Question

A number of studies have shown lichens (certain plants composed of an alga and a fungus) to be excellent bioindicators of air pollution. An article gives the following data (read from a graph) on x = NO_3^- wet deposition (g N/m^2) and y = lichen (% dry weight): The regression equation is What are the least square estimates of beta_0 and beta_1? (Round your answers to three decimal places.) Predict lichen N for an NO_3^- deposition value of 0.8. (Round your answer to three decimal places.) What is the estimate of sigma? (Round your answer to four decimal places.)

Explanation / Answer

a. beta0=y value of point of intersection of the line and the y axis. value=0.366

beta1 measures the steepness of line. Value=0.967

b. Substitute 'no3 depositior' in the equation with 0.8.

Lichen N=0.365+0.967*0.8=1.139

c. Estimate of sigm acorrespond to standard deviation of

0.1953, that is 19.53% dry weight 'noo 3 depositor' in the regression model summary output.

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