5. [6 marks] This question is inspired by a 201'? article by Vitals Shreve, Mehrkam and Udell published in the journal Behavioural Frames. Social interaction, food, scent or toys? A formal assessment of domestic cat preferenms Domestic cats {Fall's stirrestn's cattle} engage in a variety of relationships with humans. Nonetheless1 it is still common belief that cats are not especially sociable or trainable. This disconnect may be due, in pnart1 to a lack of knowledge of what stimuli cats prefer1 and thus may be most motivated to work for. Our study investigated domestic cat preferences: Adult cats were presented with stimuli from four categories to determine each cat's most-preferred stimulus [human social interaction1 foodl. toy1 and scent}. We recorded the proportion of time interacting with each stimulus. Although there was clear individual variability in cat preference1 social interaction with humans was the mom-preferred stimulus category for the majority of catsj followed by food. [a] 'What was the independent variable in study? [1 mark] [bl State the likely data type of the independent variable and explain why you reached this conclusion. [2 marks] {c} 1What was the dependent variable in study? [1 mark] [d] State the likely data type of the dependent variable and explain why you reached this conclusion. [2 marks]