A scientist suspects there is a positive correlation between the concentration of a certain nutrient in soil and the height of the plants grown in it.
He calculates the product moment correlation coefficient for a random sample of 12 plants and obtains r=0.468r = 0.468r=0.468.
Carry out a suitable test to investigate the scientist's suspicion at a 5% level of significance.
State clearly
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.