Consider the pairs of measurements shown in the table. For these data, SSxx = 38.9, SSyy =

Question:

Consider the pairs of measurements shown in the table. For these data, SSxx = 38.9, SSyy = 33.6, SSxy = 32.8, and = -.414 + .843x.

a. Construct a scatter plot for these data.
b. Plot the least squares line on your scatter plot.
c. Use a 95% confidence interval to estimate the mean value of y when xp = 6. Plot the upper and lower bounds of the interval on your scatter plot.
d. Repeat part c for xp = 3.2 and xp = 0.
e. Compare the widths of the three confidence intervals you constructed in parts c and d and explain why they differ.