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11 January, 22:55

Identify the type of sampling used: random, systematic, convenience, stratified, or cluster. To estimate the percentage of defects in a recent manufacturing batch, a quality control manager at MicrosoftMicrosoft selects every 1414th software CDsoftware CD that comes off the assembly line starting with the eightheighth until she obtains a sample of 140140 software CDssoftware CDs. Which type of sampling is used?

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  1. 11 January, 23:13
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    Systematic sampling is used.

    Step-by-step explanation:

    Samples may be classified as:

    Convenient: Sample drawn from a conveniently available pool.

    Random: Basically, put all the options into a hat and drawn some of them.

    Systematic: Every kth element is taken. For example, you want to survey something on the street, you interview every 5th person, for example.

    Cluster: Divides population into groups, called clusters, and each element in the cluster is surveyed.

    Stratified: Also divides the population into groups. However, then only some elements of the group are surveyed.

    In this question:

    Every 14th CD.

    So systematic sampling is used.
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