Question

1. Identify the sampling technique used to obtain a sample in each of the following situations

1. To determine the average number of cars per household, each household in 6 of the 18 local counties were sent a survey regarding car ownership.
2. Fourth grade reading levels across the county were analyzed by the school board by randomly selecting 17 fourth graders from each school in the county district.
3. Unique ID numbers given to students are selected randomly selected from a computer printout for free tickets to the championship game.
4. To conduct a survey on collegiate social life, you knock on every 4^th dorm room door on campus.

Answer 1

Ans: (a) The correct ans is cluster sampling

beacause first the population was divided into 18 local groups and then 6 was randomly selected and each observation from those 6 clusters were studied.

(b) this is an example of stratified sampling

because first the fourth grade population is divided into groups of school and then some 17 observations were selected from those groups

(c) This is an example of simple random sampling beachse the chanceof each student id to be selected is equal

(d) This is an eacmple of systematic sampling because In systematic sampling, the list of elements is "counted off". That is, every kth element is taken. In this case it is every 4th