Confidence Interval Table
Confindence interval table with their equivalent z-score is added below:
|
Confidence Level |
Critical Value (Z-Score) |
|---|---|
|
90% |
±1.645 |
|
95% |
±1.96 |
|
99% |
±2.576 |
Confidence Intervals for Population Mean and Proportion
Confidence intervals for population mean estimate the range within which the true mean lies, based on sample data. For proportions, they estimate the range within which the true population proportion lies. Both intervals reflect statistical certainty about the estimates.
This article explains confidence intervals, their calculation, interpretation, and applications for population means and proportions in statistics.
Table of Content
- Defining Confidence Interval
- Formula for Confidence Interval
- Confidence Interval Table
- Calculating Confidence Interval
- Example of Confidence Interval Calculation