A study was conducted to compare the average time spent in the lab each week versus course grade for computer students. The results are recorded in the table below. Find the value of the linear correlation coefficient r. Find the value of the linear correlation coefficient r. Compare the computed linear correlation coefficient r to the critical value of r at the 5% significance level to determine whether there is a linear correlation between the two characteristics. Does the slope of the regression line appear to indicate that an increase in the average time spent in the lab each week may improve the course grade for the computer students?
| Number of hours spent in lab |
Grade (percent) |
| 10 |
96 |
| 11 |
51 |
| 16 |
62 |
| 9 |
58 |
| 7 |
89 |
| 15 |
81 |
| 16 |
46 |
| 10 |
51 |