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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.

Respuesta :

Answer:

(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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