Hua is conducting a correlational study about birds feeding in her garden. Hua finds that when it is sunnier, the birds feed more. She also finds that fewer birds feed when it is more windy.

Mark scheme

Marking points from the official mark scheme (Feb/Mar 2019). The mark or mark type is shown in brackets.

1. [2] 1 mark for definition a link / relationship between two variables such that as one variable increases the other also increases (definitive) 1 mark for identification 'when it is sunnier, the birds feed more' Accept: 'More birds feed when the weather is more calm'
2. [2] 1 mark for suggestion 1 mark for detail (e.g. operationalisation) how much food they eat = 1 (suggestion) weigh the food before and after the birds have been there = 1 (detail) how heavy the bird is before and after feeding = 1 (suggestion) weigh each bird as it stands on an electronic scale = 1 (detail) count how many birds feed = 1 (suggestion) by using an observation = 1 (detail)