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 lCityville. The town has a population of 578,000 people, of which 349,000 are working age adults [ages 13-65). They sampled 293 working-age adults from the town, and collected their information. Below is a small part of that dataset: m Richard Styles 45 M $55,000 Allison Gore 29 F Michelle Jones 33 F a. What is the population in this study? Provide as much detail as necessary. b. What is the sample size? Photographer $36,000 Teacher $59,000 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