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21 April, 16:59

To determine her power usage , Keri divides up her day into three parts: morning, afternoon, and evening. She then measures her power usage at 4 randomly selected times during each part of the day. What type of sampling did she use?

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  1. 21 April, 20:54
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    Stratified Sampling

    Step-by-step explanation:

    Since Keri divides the day into different strata and each unit is selected from each strata randomly. So, it is Stratified Sampling.

    Further, In Stratified Sampling population is divided into several groups such that within the group it is homogeneous and between the group it is heterogeneous. And now a selection of each stratum and unit has an equal chance of selection.
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