Find the critical value zc necessary to form a confidence interval at the level of confidence shown below. c=0.80

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Find the critical value zc necessary to form a confidence interval at the level of confidence shown below. c=0.80

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Thạch Thảo 3 years 2021-08-19T18:34:07+00:00 1 Answers 328 views 0

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  1. huyenthanh
    0
    2021-08-19T18:35:39+00:00
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    Answer:

    1.28

    Step-by-step explanation:

    Given a confidence (c) = 0.80

    α = 1 – c = 1 – 0.8 = 0.2

    α/2 = 0.2/2 = 0.1

    From the normal distribution table, The critical value necessary to form a confidence interval is gotten by getting the z value of α/2, which is the same as that of 0.4 (0.5 – 0.1). The z value of α/2 is:

    z_\frac{\alpha}{2} =z_{0.01}=1.28

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