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.
278 exam-style questions on CCEA A Level Maths 2.5 Data presentation and interpretation, covering 2.5.1 Data presentation and interpretation, 2.5.2 Data presentation and interpretation, 2.5.3 Data presentation and interpretation, 2.5.4 Data presentation and interpretation, 2.5.5 Data presentation and interpretation, 2.5.6 Data presentation and interpretation, 2.5.7 Data presentation and interpretation, 2.5.8 Data presentation and interpretation, 2.5.9 Data presentation and interpretation, and 2.5 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.