A chemical engineer is investigating the relationship between the reaction temperature TTT, in degrees Celsius, and the volume of byproduct VVV, in millilitres, produced in a specific industrial process. A sample of 50 reactions was monitored and the results were recorded.
The following summary statistics were calculated from these data:
∑T=1250,∑T2=32000,∑V=8000,∑TV=198400,SVV=4500 \sum T = 1250, \quad \sum T^2 = 32000, \quad \sum V = 8000, \quad \sum TV = 198400, \quad S_{VV} = 4500 ∑T=1250,∑T2=32000,∑V=8000,∑TV=198400,SVV=4500Find STTS_{TT}STT and STVS_{TV}STV.
Calculate, to 3 significant figures, the product moment correlation coefficient between TTT and VVV.
Give an interpretation of your coefficient in the context of the engineer's study.
202 exam-style questions on Edexcel A Level Maths Regression, Correlation and Hypothesis Testing, covering 1.1 Exponential Models, 1.2 Measuring Correlation, and 1.3 Hypothesis Testing for Zero Correlation. Each one has a worked solution and a mark scheme showing where the marks go.