Annie wants to estimate the average number of AP classes a student at her high school takes. She decides to randomly select 6 classes and use all the students in those 6 classes to estimate the average. What type of sampling did Annie use? Select the correct answer below:A. Cluster samplingB. Stratified samplingC. Convenience samplingD. Systematic sampling


Cluster sampling

Step-by-step explanation:

To find, which type of sampling used, we first know the definition of cluster sampling.

Definition of cluster sampling:

Cluster sampling is a type of sampling method in which the population is divided into already existing groups or clusters. Then a sample of the cluster is selected randomly from the population.

In this problem, population is high school and sample of the cluster is 6 classes.  So, Annie used Cluster sampling in this problem.

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