Question

a city mayor is interested in determining what percentage of the city residents who are satisfied with the citys public transportation system. the mayor randomly selects 1000 city residents to respond to a survey. which of these is the sample?
1000 city residents
all city residents
percentage of all city residents who are satisfied with the citys transportation system
percentage of all 1000 residents who are satisfied with the citys transportation system

a magazine editor wants to randomly select 8 vehicles from a list of 20 top - selling cars and trucks in the united states, to do a review for the next months issue. describe how to do simple random sampling in this situation
assign numbers from 1 to 20, and select every 3rd vehicle to make the sample
divide the cars into different groups and pick 1 or 2 cars from each group to make a sample of 8 cars.
assign numbers from 1 to 20 to the cars, and select 8 numbers using random number generator, and cars with those numbers will be sample of 8 cars
divide the cars into different groups and pick 1 or 2 groups with all cars in that group to make a sample of 8 cars

Explanation:

1. In the first - case, a sample is a subset of the population selected for study. Here, the mayor selects 1000 city residents out of all city residents. So the 1000 city residents are the sample.
2. For simple random sampling, each member of the population should have an equal chance of being selected. Assigning numbers from 1 to 20 to the 20 cars and using a Random Number Generator to select 8 numbers ensures that each car has an equal probability of being chosen.

Answer:

1. 1000 city residents
2. Assign numbers from 1 to 20 to the cars, and select 8 numbers using Random Number Generator, and cars with those numbers will be sample of 8 cars