Consider the following pairs of measurements, saved in the LM9_95 file. x4605232621y35-14...

Consider the following pairs of measurements, saved in the LM9_95 file.

For these data, SSxx = 38.900, SSyy = 33.600, SSxy = 32.8, and

a. Construct a scatterplot of the data.

---

b. Plot the least squares line on your scatterplot.

---

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 scatterplot.

---

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.