Calculate confidence intervals for sample means using t distribution easily in statistics analysis today
| Sample Data |
|---|
| 12,15,14,10,13,15,16,14,12 |
CI = Mean ± (t * (SD / √n))
Where SD = sample standard deviation, t = Student t value from table.
Enter comma separated sample data. Choose confidence level. Press calculate. View mean, SD, margin, and interval.
Confidence interval estimates the range in which population mean lies. It accounts for variability and sample size. A higher confidence level yields wider interval.
1. What is t confidence interval?
A t confidence interval estimates population mean for small samples with unknown SD.
2. How many data points needed?
At least two values are required to compute standard deviation and interval.
3. Why use t instead of z?
t accounts for extra uncertainty when sample size is small and population SD unknown.
4. Can I use negative numbers?
Yes, t confidence intervals support negative, zero, and positive sample values.
5. What confidence levels are supported?
80%, 90%, 95%, and 99% levels are included in the calculator.
6. How to interpret result?
The population mean is likely within the interval at the chosen confidence level.
7. Can I export results?
Yes, CSV and PDF downloads are provided directly from results section.
8. What if data has decimals?
Decimal numbers are fully supported. Just separate values with commas in input field.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.