What is the z-score for a 98% confidence interval?
Understand the Problem
The question is asking for the z-score that corresponds to a 98% confidence interval. This value is commonly used in statistics to determine how many standard deviations away from the mean a certain percentage of data falls. To find the z-score for a 98% confidence level, we look for the value in the standard normal distribution that corresponds to the area in the tails of the distribution.
Answer
2.33
The z-score for a 98% confidence interval is approximately 2.33.
Answer for screen readers
The z-score for a 98% confidence interval is approximately 2.33.
More Information
The z-score for a specific confidence interval is derived from the standard normal distribution table and represents the number of standard deviations a data point is from the mean.
Tips
A common mistake is confusing the z-score for a confidence interval with the t-score, which is used for small sample sizes.
Sources
- What is the z-score for a 98% confidence interval? - Socratic - socratic.org
- 12.2: Normal Critical Values for Confidence Levels - stats.libretexts.org
