Use the model you prefer for the data of Exercise 11.70 to predict the length of time...

Use the model you prefer for the data of Exercise 11.70 to predict the length of time in months before approval of a $750,000 contract. Give a rough estimate of a 95% prediction interval.

REFERENCE:

11.70 : Refer to the data of Exercise 11.69. A plot of y versus the (natural) logarithm of x is shown and more Stata output is given here:

a. What is the regression line using log x as the independent variable?

b. Conduct a test of and give the level of significance for a one-sided alternative,