In: Statistics and Probability
Investment analysts generally believe the interest rate on bonds is related to the prime interest rate for loans.
| Prime interest rate | Bond rate |
| 5.00% | 28.00% |
| 12.00% | 48.00% |
| 9.00% | 32.00% |
| 1.50% | 4.00% |
| 0.40% | 7.00% |
| 11.00% | 36.00% |
| 6.00% | 28.00% |
| 2.00% | 10.50% |
Question (a)
The scatter plot with regression formula and the r-squared values is as follows

Question (b)
The R2 value here is 0.9184
The value of correlation coefficient r =
= 0.9588
Here number of observation,n = 8
Degress of freedom = n - 2
= 6
Significance level
= 0.05 by default
The crtical r-value for 6 degrees of freedom and
value of 0.05 = 0.707 from the below attached table
Since the correlation coefficient r value of 0.9588 is more than the critical r-value of 0.707, the bond rate can be predicted by the prime interest rate
