A botanist records leaf length and leaf width for a random sample of 20 plants of one species. The sample product moment correlation coefficient is 0.431. For a two-tailed test at the 5% significance level, the critical values are ±0.4438\pm0.4438±0.4438.
Carry out the test and interpret the result.
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.