Confidence intervals are a means of assessing the accuracy of sample data. If you read that the average expected range of birth weight of newborns in your area falls between 2 and 12 lbs, what additional information is required in order to predict a 95% confidence interval in terms of birth weights?
A) z-score and standard error of the sample
B) mean and standard deviations of the sample, and z-score
C) mean and standard deviations of the sample
D) mean and z-score of the sample

Question

Quizplus · Accepted Answer

To calculate a 95% confidence interval, you need the mean and standard deviation of the sample to understand the distribution, and the z-score to determine the margin of error.

Confidence Intervals Are a Means of Assessing the Accuracy of Sample