The director of an alumni association wants to determine whether there is any type of relationship between
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Question:
The director of an alumni association wants to determine whether there is any type of relationship between the amount of an alumni's contribution (in dollars) and the number of years the alumnus has been out of school. Based on the data below, decide if the correlation between the number of years and amount of the contribution is significant at the alpha value of 0.05.
| Years (x) | 1 | 3 | 5 | 10 | 6 | 9 |
| Contribution (y) | 640 | 290 | 170 | 45 | 70 | 80 |
a) Determine r^2.
b) Determine S est
c) Find the 95% prediction interval when x = 8.
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