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
52 exam-style questions on Edexcel A Level Maths 1.3 Hypothesis Testing for Zero Correlation. Each one has a worked solution and a mark scheme showing where the marks go.