Refer to Exercise 14. Someone wants to compute a 95% confidence interval for the mean runoff when the rainfall is 3 in. Can this be computed from the information in the MINITAB output shown in Exercise 14? Or is more information needed? Choose the best answer.

i. Yes, it can be computed from the MINITAB output.

ii. No, we also need to know the rainfall values that were used to compute the least-squares line.

iii. No, we also need to know the runoff values that were used to compute the least-squares line.

iv. No, we also need to know both the rainfall and the runoff values that were used to compute the least-squares line.1

Refer to Exercise 14.

The article “Approach to Confidence Interval Estimation for Curve Numbers” (R. McCuen, Journal of Hydrologic Engineering, 2002:43–48) discusses the relationship between rainfall depth and runoff depth at several locations. At one particular location, rainfall depth and runoff depth were recorded for 13 rainstorms. Following is MINITAB output for a fit of the least-squares line to predict runoff depth from rainfall depth (both measured in inches).