Calculate Low or High in Confidence Interval
Calculating the low or high in confidence interval is crucial for understanding the reliability of your data and making informed decisions. This tool will help you calculate the confidence interval for your data set.
- Enter your sample size, confidence level, mean, and standard deviation.
- Click ‘Calculate’.
- View your results below the calculator.
The formula for calculating the confidence interval is:
Confidence Interval = Mean ± (Z * (Standard Deviation / √Sample Size))
Where Z is the Z-score corresponding to your chosen confidence level.
| Confidence Level | Z-Score |
|---|---|
| 90% | 1.645 |
| 95% | 1.96 |
| 99% | 2.576 |
- Always use the appropriate Z-score for your desired confidence level.
- Ensure your sample size is large enough to provide a reliable estimate.
- Consider using a t-distribution instead of the Z-score if your sample size is small.
What is a confidence interval?
A confidence interval is a range of values around a sample statistic (like the mean) that indicates the reliability of the statistic.