Cool Down Lesson 2: Study Types Cool Down: Beauty Is In The Eye Of The Beholder A researcher discovers that the diameter of a person's pupil in their eye is directly related to how beautiful they find the image they are looking at. The researcher wants to know whether reading an article about climate change influences people's perception of pictures of a city in terms of beauty. 100 people have volunteered to be a part of the study. The researcher's assistants propose 3 options to run the study. 1. Match each of the options to the type of study: survey, observational study, or experimental study. a. The volunteers are split into 2 groups by a random process. One group will read the article and the other will not. Everyone will then look at the city pictures and the diameter of their pupil will be measured while they look at the pictures. b. The volunteers look at the pictures of the city and rate how beautiful they find the pictures on a scale of 1 to 10. They then read the article and look at the pictures again, rating them on the same scale. c. The volunteers are shown into an art gallery with the pictures of the city on the wall and the article in a program given to the people when they enter. The researcher will keep track of who reads the program and measure the pupil size of people as they view the pictures. 2. Which option should the researcher use? Explain your reasoning