Final answer:
In the scenario, the researchers weighing 500 individuals at a park to estimate the average weight of people in Toronto are using a d)sample to represent the entire population.
Step-by-step explanation:
To determine the average weight of people in Toronto, researchers weigh 500 individuals of all ages at a public park on Saturday. This scenario describes an instance of d. Sample. A sample is a subset of individuals from a larger population used to estimate characteristics of that entire population. In this example, the 500 individuals are a sample that aims to represent the population of Toronto.
The population would be all the people in Toronto, the sample consists of the 500 individuals weighed, the parameter would be the true average weight of the entire population, while the statistic is the calculated average weight based on the sample.
As a reference, in statistics, other key terms include a variable, which is a characteristic measured in a study (in this case, weight), and data, which refers to the actual weights recorded for the 500 individuals.