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28 April, 02:22

Identify which of these types of sampling is used:

A large company wants to administer a satisfaction survey to its current customers. Using their customer database, the company randomly selects 70 customers and asks them about their level of satisfaction with the company. What type of sampling is used?

a) Random

b) Systematic

c) Convenience

d) Stratified

e) Cluster

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  1. 28 April, 02:25
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    d) Stratified and a) Random

    Explanation:

    In an stratified sampling, people is divided into groups by a characteristic. In the question, the company takes the customer database. This means that all the people in this database have the common characteristic: customer.

    Having the strata group, in this case the customer database, the company then selects a random sample of this database by selecting randomly 70 customers. A random sample means that each person in the customer database has the same probability of being chosen for the survey, no matter the amount of customers in the database.
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