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    Question

    A systematic sample does not yield good result, if -

    A Variation in units is periodic Correct Answer Incorrect Answer
    B Units at regular intervals are correlated Correct Answer Incorrect Answer
    C Both (a) and (b) Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    a 1 in x systematic random sample is obtained by randomly selecting one of the first "x" units in the sampling frame and then selecting every subsequent xth unit Its generally used in a continuous process. First observation is chosen randomly and then other observations are picked by adding some constant "c" to the successive observations. c = N/n where N = size of population and n = size of sample It's important to check that the data is not having a periodic property. (Foe eg. If sales are analysed and x is taken as 7, then sample will include the sales on the same day of every week)

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