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MA Chapter 2 Questions Sources of Data

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  1. mannannagpal says

    August 2, 2022 at 11:24 am

    Is “knowing each item in the population” important in random sampling?

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  2. mbarrie says

    July 19, 2022 at 8:49 am

    It was helpful ??thank you very much,but please if the answers would be shown after the test it will be nice *

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    • John Moffat says

      July 19, 2022 at 8:51 am

      The answers are shown if you click on the ‘review quiz’ button after having submitted your answers!

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  3. mannannagpal says

    June 29, 2022 at 12:28 pm

    is “knowing each item in the population” also important in systematic sampling?

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    • John Moffat says

      June 29, 2022 at 4:43 pm

      No, because we would be selecting every n’th item regardless of what was the case in the population as a whole.

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  4. mannannagpal says

    December 27, 2021 at 2:47 pm

    Could you please explain what is population data and what is continuous data?

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    • John Moffat says

      December 28, 2021 at 5:05 pm

      The population is all the items in the particular category (out of which we take a sample).

      Continuous data is explained in the lectures on Measures of average and dispersion.

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  5. EstherLam says

    December 6, 2021 at 7:54 am

    Question 3

    How is the knowledge of each item of the population true of Stratified sampling ?

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    • John Moffat says

      December 6, 2021 at 8:36 am

      You have to know what proportion of the population are in each group in order to know what proportion of each group to sample.

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  6. daslanov says

    August 20, 2021 at 1:14 pm

    Question 2. Why is not multistage sampling, although there is no such answer to choose?

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    • John Moffat says

      August 20, 2021 at 1:52 pm

      Because taking every 20th item is systematic sampling, not multistage sampling.

      See the explanation of both in our free lectures notes and the free lectures that go with the notes.

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      • daslanov says

        August 21, 2021 at 12:27 pm

        Now I noticed the tricky moment in the question, it starts just pocking 12th iteam, NOT each 12th iteam.
        Thank you for the help, sir

      • John Moffat says

        August 22, 2021 at 9:21 am

        You are welcome 馃檪

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