An environmental scientist studied the relationship between the daily average temperature, xxx (in ∘C^{\circ}\text{C}∘C), and the daily electricity consumption, yyy (in MWh), for a small town over 15 days in summer. The following summary statistics were calculated:
Sxx=450.4Syy=1240.2Sxy=652.8 S_{xx} = 450.4 \quad S_{yy} = 1240.2 \quad S_{xy} = 652.8 Sxx=450.4Syy=1240.2Sxy=652.8Calculate the product moment correlation coefficient (PMCC) for these data.
Interpret the value of the PMCC in the context of the study.
A student later coded the data by multiplying the temperature figures by 1.8 and adding 32 (to convert to Fahrenheit). Write down the value of the PMCC calculated using the coded data.
Practise Edexcel A Level Maths Regression, Correlation and Hypothesis Testing with exam-style questions for A Level Maths. 202 questions covering Exponential Models, Measuring Correlation, and Hypothesis Testing for Zero Correlation, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
