2.045 or 1.96 for t?

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This topic contains 2 replies, has 2 voices, and was last updated by  Nathalie Avril 10 years, 9 months ago.

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  • July 24, 2015 at 3:44 pm #1546

    Nathalie Avril
    Participant

    Hi,
    Please, could you explain me why in the calculation of the sample size we use 2.045 and not 1.96 for t.
    Many thanks!
    Nathalie

    July 27, 2015 at 5:41 pm #1552

    SMART
    Keymaster

    For cluster surveys t=2.045 is used in the sample size calculation because the number of clusters is typically 30 clusters or less. In Simple Random Surveys (non-cluster) z=1.96 is used because the degrees of freedom is high (over 100).

    July 29, 2015 at 1:14 pm #1554

    Nathalie Avril
    Participant

    Thnaks!

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