The following data show the number of hours studied for an exam, x, and the grade received on the exam, y (y is measured in 10's; that is, y = 8 means that the grade, rounded to the nearest 10 points, is 80).
| 2 |
2 |
2 |
3 |
3 |
3 |
4 |
4 |
4 |
5 |
5 |
6 |
7 |
7 |
8 |
| 6 |
7 |
8 |
5 |
6 |
8 |
6 |
7 |
8 |
8 |
9 |
10 |
8 |
10 |
10 |
Calculate the estimated standard error of regression, sb1, for the number of hours studied-exam grade relationship explained above. (Give your answer correct to four decimal places.)