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28 November, 14:20

hat z-score is used for a 99% confidence interval to estimate a population proportion? (skip the z-table, get one more decimal place of accuracy from the notes, your calculator, or click this online calculator.) Use 3 decimal places in your answer. (b) What z-score is used for a 94% confidence interval? Round your answer to 2 decimal places. (c) What z-score is used for a 93% confidence interval? Round your answer to 2 decimal places.

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  1. 28 November, 14:49
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    (a) z-score for 99% confidence interval = 2.575

    (b) z-score for 94% confidence interval = 1.88

    (b) z-score for 93% confidence interval = 1.81

    Step-by-step explanation:

    Confidence Interval:

    The confidence interval indicates the level of confidence that the true parameter lies in the proposed range.

    (a) What z-score is used for a 99% confidence interval to estimate a population proportion? Use 3 decimal places in your answer.

    z-score for 99% confidence interval = 2.575

    (b) What z-score is used for a 94% confidence interval? Round your answer to 2 decimal places.

    z-score for 94% confidence interval = 1.88

    (c) What z-score is used for a 93% confidence interval? Round your answer to 2 decimal places.

    z-score for 93% confidence interval = 1.81
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