When the population standard deviation is known, the formula for a confidence interval (CI) for a population mean is x̄ ± z* σ/√n, where x̄ is the sample mean, σ is the population standard deviation, n is the sample size, and z* represents the appropriate z*-value from the standard normal distribution for your desired …
Also question is, how do I calculate 95 confidence interval in SPSS?
Keeping this in consideration, how do you calculate confidence interval by hand?
In this regard, how do you calculate confidence intervals in Excel?
What is the confidence interval of 98%?
Z-values for Confidence Intervals
| Confidence Level | Z Value |
|---|---|
| 85% | 1.440 |
| 90% | 1.645 |
| 95% | 1.960 |
| 98% | 2.326 |
What is Z value for 95 confidence interval?
-1.96