A sample of 14 trees gives a product moment correlation coefficient of r=0.71r=0.71r=0.71 between trunk circumference and height. State the null and alternative hypotheses for a test of positive correlation.
178 exam-style questions on WJEC A Level Maths 4.3.1 Statistical hypothesis testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.