Correlation and Linear Regression

2013 RI P2 Q9 The data below shows the average height, measured in feet, of cherry trees from age $1$ year to age $11$ years. (i) Calculate $r$, the value

2013 IJC P2 Q9  John is training for National Shooting Championship and he practices shooting each week. His percentage score, $y%$ in week $x$, are as follows. (i) Draw a

2017 HCI P2 Q10 A large cohort of students sat for a mathematics examination. Based on selected data of the examination results, the following table shows $y$, the proportions of

2017 ACJC P2 Q8 A swim school takes in both male and female primary school students for competitive swimming lessons. The school assesses its students’ progress each year by recording

2017 DHS P2 Q8 A retail manager of a large electrical appliances store wants to investigate the relationship between the monthly advertising expenditure, $x$ hundred dollars, and the monthly sales

2015 AJC P2 Q8 It is believed that there is a correlation between the number of fogging sessions and the number of new dengue cases. To test the effectiveness of

2012 NJC P2 Q6 The table below gives the values of a set of bivariate data comprising ten observations of $x$ and $y$. (i) Sketch the scatter diagram and determine

2013 TJC P2 Q11(b) May travels regularly from home to the hospital for treatment. She leaves home at $x$ minutes after 8 am and takes $y$ minutes to arrive at

2010 MI P2 Q8 In a particular study, a medical student recorded the age and blood pressure of 8 men. The regression line of $y$ on $x$ is determined to