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27 December, 00:52

Find the value za/2 needed to constrict a confident interval with level 87%

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  1. 27 December, 01:19
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    The value za/2 needed to constrict a confident interval with level 87% is 1.51

    Step-by-step explanation:

    At 87% confidence level the z is,

    α = 1 - 87%

    = 1 - 0.87

    = 0.13

    α / 2 = 0.13 / 2

    = 0.065

    Zα/2 = Z0.065

    = 1.51 (Using z table)
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