Liam is investigating whether there is a correlation between the daily maximum temperature and the daily sales of hot chocolate at his café.
He collects data for a random sample of 25 days and calculates a product moment correlation coefficient of r=−0.42r = -0.42r=−0.42.
Carry out a suitable test to investigate Liam's belief at a 5% level of significance.
State clearly
Practise Edexcel A Level Maths Regression, Correlation and Hypothesis Testing with exam-style questions for A Level Maths. 100 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.