The grades of a class of 9 students on a midterm report $(x)$ and on the final examination $(y)$ are as follows: $$ \begin{array}{c|ccccccccc} x & 77 & 50 & 71 & 72 & 81 & 94 & 96 & 99 & 67 \\ \hline y & 82 & 66 & 78 & 34 & 47 & 85 & 99 & 99 & 68 \end{array} $$ (a) Estimate the linear regression line. (b) Estimate the final examination grade of a student who received a grade of 85 on the midterm report.
Added by Lisa B.
Step 1
Mean of x (x̄) = (77+50+71+72+81+94+96+99+67)/9 = 75.33 Mean of y (ȳ) = (82+66+78+34+47+85+99+99+68)/9 = 73.11 Show more…
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