Consider the following scenario:Both individual characteristics (wealth, education) and environmental characteristics (access to social network, safety) can impact health of elderly people. What is uncertain is whether geographical characteristics (beyond the obvious of pollution, access to clean drinking water, etc.) can impact health. "Healthy cities" are designed to be pedestrian friendly, have well-developed (and economical) transit systems, have local access to medical services, and plenty of outdoor recreational areas (e.g. parks with trees, etc.). A city developer is keen to understand the impact of healthy city design on the health of elderly people.The developer has obtained a sample of elderly living in a healthy city, as well as one living in a typical city. The developer has collected data from each elderly individual as follows: their age (y) the number of years of school they completed their perceived health, measured by asking the question, "What do you think of your health level?", for whichthe responses were 1 = very bad, 2 = bad, 3 = fair, 4 = good, and 5 = very good. how frequently they visit recreational areas in their neighbourhood (possible choices: never, infrequently, sometimes, frequently) their gender (male, female, nonbinary) the time elapsed since they last visited a medical professional (possible choices were: within the last week, last month, between two and 5 months ago, more than 5 months ago) their annual income ($) based on salary, retirement earnings, etc.