CASTI-89 TITANIUM (STATS/LIST EDITOR APP) · CALC89
tInterval
Computes a t confidence interval for a population mean when σ is unknown. The results are stored in stat variables such as stat.CUpper.
Syntax
tInterval List[,Freq[,CLevel]]
- Group
- Statistics
- Arguments
- Takes 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 |
|---|---|
| tInterval 48.6,1.8,9,0.95:stat.CUpper | 49.9836024811 |
Typing tInterval 48.6,1.8,9,0.95:stat.CUpper on the home screen and pressing ENTER returns 49.9836024811.
Related commands
- tInterval_2SampComputes a t confidence interval for the difference of two population means.
- tTestPerforms a one sample t test on a population mean when σ is unknown.
- tTest_2SampPerforms a two sample t test on the difference of two population means.
- TwoVarComputes two variable statistics of paired data, such as means, sums and the correlation.
- varPop(Returns the population variance of a list.
- varSamp(Returns the sample variance of a list.
- zIntervalComputes a z confidence interval for a population mean when σ is known.
- zInterval_1PropComputes a z confidence interval for a population proportion.