IB skill practice

Use correlation and regression

Use correlation and regression lines to interpret association and make sensible predictions.

Paper 2 6 marks Difficulty 2

Regression prediction practice

A regression model for study time \(x\) hours and score \(y\) is \(\hat{y}=6x+25\). Predict the score when \(x=7\), and state the gradient and intercept.

Worked practice: regression model

State the regression line parameters, then substitute the x-value to predict y.