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Determine the type of sampling (random, stratified, systematic,
cluster, convenience) being conducted in the following situations.
a. On election day, a pollster for XYZ News positions herself outside a polling place near her office. She then asks the first 50 voters leaving the polling place to complete a survey.
b. An internet service provider randomly selects 15 residential blocks from a large city. It then surveys every household in these 15 blocks to determine the number that would upgrade to higher speed service, if it were available.
c. At a high school there are 574 sophomores, 562 juniors, and 532 seniors. The principal randomly selects 30 students from each group (sophomores, juniors, and seniors) to take a survey on the cafeteria’s food.
d. Officials for the PA Turnpike Commission offer a survey to every 50th vehicle passing through a toll facility.

Respuesta :

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Answer:

a. Convenience

b. Random

c. Stratified

d. Systematic

Explanation:

Types of sampling:

  • Random:

The selection of sample is arbitrary and each member has an equal chance of selection.

  • Convenience

This selection does not take probability of selection into account rather focuses on the convenience and proximity of the member for selection.

  • Systematic

An ordered system is decided to choose the members for this sample.

  • Cluster

This sampling plan divided the population into groups, called clusters. A cluster is then randomly selected from the selected population.

  • Stratified

The members of the population are divided into groups, called strata. A random sample is drawn from each strata.

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