An environmental study records the daily duration of sunshine, sss hours, and the corresponding maximum electricity yield, EEE kWh, from a fixed solar panel array. Over n=15n=15n=15 days, the following summary statistics were obtained:
∑s=120∑s2=1120∑E=600∑E2=25500∑sE=5250 \sum s = 120 \quad \sum s^2 = 1120 \quad \sum E = 600 \quad \sum E^2 = 25500 \quad \sum sE = 5250 ∑s=120∑s2=1120∑E=600∑E2=25500∑sE=5250Find the values of SssS_{ss}Sss and SsES_{sE}SsE.
Given that SEE=1500S_{EE} = 1500SEE=1500,
calculate the product moment correlation coefficient, rrr.
Interpret your value of rrr in the context of the study.
278 exam-style questions on CCEA A Level Maths 2.5 Data presentation and interpretation, covering 2.5.1 Data presentation and interpretation, 2.5.2 Data presentation and interpretation, 2.5.3 Data presentation and interpretation, 2.5.4 Data presentation and interpretation, 2.5.5 Data presentation and interpretation, 2.5.6 Data presentation and interpretation, 2.5.7 Data presentation and interpretation, 2.5.8 Data presentation and interpretation, 2.5.9 Data presentation and interpretation, and 2.5 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.