For the data in Exercise 15.9, find the standard error of estimate, then construct the 95% prediction

Question:

For the data in Exercise 15.9, find the standard error of estimate, then construct the 95% prediction interval for the amount of stock owned by an individual employee who has been with the firm for 5 years.
In exercise
x = Years y = Shares
6....... 300
12........ 408
14........ 560
6....... 252
9....... 288
13........ 650
15........ 630
9....... 522