Use the data set 1. Plot the data.

2. Fit a regression line through the origin.

3. Plot the regression line on the graph with the data.

4. Give a general formula (in terms of the y and the slope b )

for the estimator of σ .

5. Give a formula for Var( ), i = 1, 2, …, n, for this case.

6. Plot 95% confidence limits for the mean response on the graph around the regression line.