Question

A high–school student is interested in the effects of sleep on the results of an exam. She decides to investigate this relationship by asking five of her friends how much sleep they got before an exam and then later asking them their marks. The following information is given: PXi D 34:5 PYi D 317 PXiYi D 2 451 PX2 i D 286:25 PY2 i D 21 563 Which one of the following statements is correct? 1. N X D 6:9 N Y D 63:4 2. b0 D 5:471 3. b1 D 25:65 4. O Y D 5:471C25:65X 5. The predicted exam marks if the student sleep for three hours is 31.

Answer 1