The monthly rainfall, $x$ mm, and the average wind speed, $y$ knots, were recorded in 10 coastal locations over a period of one month. The data are summarised below:

$S_{xx} = 4\,225$ $∑y=145\sum y = 145$ $250\sum y^2 = 2\,250$ $S_{xy} = 652.5$

Calculate, to 3 significant figures, the product moment correlation coefficient for these data.

Give an interpretation of your coefficient in context.

A researcher decides to use the variable $w$ to represent rainfall in centimetres, where $\frac{x}{10}$ .

Write down the value of $S_{ww}$ .

Write down the value of the product moment correlation coefficient between $w$ and $y$ .

The monthly rainfall, $x$ mm, and the average wind speed, $y$ knots, were recorded in 10 coastal locations over a period of one month. The data are summarised below:

$S_{xx} = 4\,225$ $∑y=145\sum y = 145$ $250\sum y^2 = 2\,250$ $S_{xy} = 652.5$

Calculate, to 3 significant figures, the product moment correlation coefficient for these data.

Give an interpretation of your coefficient in context.

A researcher decides to use the variable $w$ to represent rainfall in centimetres, where $\frac{x}{10}$ .

Write down the value of $S_{ww}$ .

Write down the value of the product moment correlation coefficient between $w$ and $y$ .

2.2.2 Scatter diagrams and correlation

Question 72

Markscheme

2.2.2 Scatter diagrams and correlation

Question 72

Markscheme

2.2.2 Scatter diagrams and correlation

Question 72

2.2.2 Scatter diagrams and correlation Questions

2.2.2 Scatter diagrams and correlation

Question 72

2.2.2 Scatter diagrams and correlation Questions