A random sample of 11 statistics students produced the following data where x is the third exam score, out of 80, and y is the final exam score, out of 200.
THIRD EXAM SCORE (X) FINAL EXAM SCORE (Y)
65 175
67 133
71 185
71 163
66 126
75 198
67 153
70 163
71 159
69 151
69 159
A) Predict the final score if the person obtains a third exam score of 68.
B) Calculate the standard error of the estimate.
C) Give the percentage of variation explained by regression.
2. The regression line = 3 + 2x has been fitted to the data points (4,8) , (2,5) and (1,2). The sum of the squared residuals will be