A student obtains r=−0.57r=-0.57r=−0.57 from a sample of 30 paired observations. For a two-tailed test, the critical values are ±0.463 \pm0.463\,±0.463 at the 1% level and ±0.570 \pm0.570\,±0.570 at the 0.1% level.
State, with reasons, the conclusions at both significance levels.
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.