1. (4 marks) A group of researchers conducted a study to determine the effect of various factors on a person's salary, in the town of Cityville. The town has a population of 578,000 people, of which 349,000 are working age adults (ages 18-65). They sampled 293 working-age adults from the town, and collected their information. Below is a small part of that dataset: Name Age Gender Occupation Salary Richard Styles 45 M Carpenter $55,000 Allison Gere 29 F Photographer $36,000 Michelle Jones 33 F Teacher $59,000 a. What is the population in this study? Provide as much detail as necessary. b. What is the sample size? c. What are the variables measured on each individual in the sample? For each variable, state whether it is a categorical variable or a numerical variable