Emile has calculated a one-tailed z-statistic of -1.97 and wants to see if it is significant at the 5% significance level. What

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Emile has calculated a one-tailed z-statistic of -1.97 and wants to see if it is significant at the 5% significance level.

What is the critical value for the 5% significance level? Answer choices are rounded to the hundredths place.

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Thông Đạt 3 years 2021-08-30T16:49:57+00:00 1 Answers 29 views 0

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    2021-08-30T16:51:55+00:00

    Answer:

    Z = -1.65

    Step-by-step explanation:

    Z-score:

    In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

    Z = \frac{X - \mu}{\sigma}

    The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

    What is the critical value for the 5% significance level?

    One-tailed statistic, so Z with a p-value of 0.05.

    Looking at the z-table, this is Z = -1.65, so this is the critical value for the 5% significance leve.

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