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
