If 95% and 98% confidence intervals were developed to estimate the true cost of an MP3 player with a known population standard deviation,what differences would they have?
A)The standard errors would be different.
B)The point estimates of the population mean would be different.
C)The sample sizes would be different.
D)The z-statistics would be different.

Question

Quizplus · Accepted Answer

The z-statistics used to calculate the confidence intervals would differ because the confidence level affects the z-score, with a higher confidence level (98%) requiring a larger z-score than a lower confidence level (95%). The standard error, point estimate, and sample size remain constant; only the critical value (z-statistic) changes to reflect the confidence level.

If 95% and 98% Confidence Intervals Were Developed to Estimate