Question

Question 18 Unsaved

Answer 1

The correct answer would be vision test. This is the variable of interest if you are studying the effects of UV rays on eyesight and you group 10 people together and make them wear sunglasses for 10 weeks and see if their eye sight is affected and then take another group and do not give them sunglasses and test their vision after 10 weeks.

Answer 2

Answer:

Effects of UV rays on eyesight

Step-by-step explanation:

The focus of this study is revealed early in the text, "If you are studying the effects of UV rays on eyesight."  The focus of a study is always the main objective of this study. If you want to study the effects of UV rays on vision is why the focus of your study is to determine how these rays work in vision and what the consequences  of it.