Does anyone know the answer to this?

Question 5 spring semester final exam math evaluate

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

The dash figure is a dilation if the original figure. find the scale factor. classify the dilation as an enlargement or a reduction