Exam-Style Question on Correlation
A mathematics exam-style question with a worked solution that can be revealed gradually
Question id: 369. This question is similar to one that appeared on an IB AA Standard paper (specimen) for 2021. The use of a calculator is allowed.
A pair of twins, Percy and Patsy, take Maths assessment tests each week. Their teacher records their scores in this table:
|Week 1||Week 2||Week 3||Week 4||Week 5||Week 6||Week 7||Week 8|
(a) Find an equation of the regression line of \(x\) on \(y\). The equation should be written in the form \(x = ay + b\).
(b) Find an equation of the regression line of \(y\) on \(x\). The equation should be written in the form \(y = ax + b\)
(c) Find the coordinates of the point of intersection of these two lines.
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