CASTI-89 TITANIUM (STATS/LIST EDITOR APP) · CALC89
zInterval
Computes a z confidence interval for a population mean when σ is known. The results are stored in stat variables such as stat.CLower.
Syntax
zInterval σ,List[,Freq[,CLevel]]
- Group
- Statistics
- Arguments
- Takes σ and a data list with optional frequency and confidence level, or the summary statistics as in the example.
- Availability
- Included
- Origin
- On the TI-89 Titanium this command comes with the preinstalled Stats/List Editor app
Example
| Input | Result |
|---|---|
| zInterval 1.8,48.6,9,0.95:stat.CLower | 47.4240216093 |
Typing zInterval 1.8,48.6,9,0.95:stat.CLower on the home screen and pressing ENTER returns 47.4240216093.
Related commands
- zInterval_1PropComputes a z confidence interval for a population proportion.
- zInterval_2PropComputes a z confidence interval for the difference of two proportions.
- zInterval_2SampComputes a z confidence interval for the difference of two population means with known σ.
- zTestPerforms a one sample z test on a population mean when σ is known.
- zTest_1PropPerforms a one proportion z test.
- zTest_2PropPerforms a two proportion z test that compares two population proportions.
- zTest_2SampPerforms a two sample z test on the difference of two population means with known σ.
- χ²2wayPerforms a χ² test for association on a two way table of observed counts; it is the same command as chi22way.