T-Test Calculator
A t-test calculator helps determine if there's a significant difference between two groups' means. It's used in research, quality control, and data analysis to validate hypotheses. By inputting sample data, users get t-values and p-values to make statistically informed decisions.
Formula
t = (x̄₁ - x̄₂) / √(s²/n₁ + s²/n₂)
Where x̄ = mean, s² = variance, n = sample size
Critical Values Table
| Confidence Level | Critical Value (2-tailed) |
|---|---|
| 90% | 1.645 |
| 95% | 1.960 |
| 99% | 2.576 |
How to Use
1. Enter comma-separated numbers for both groups
2. Click Calculate
3. Compare t-value with critical values
4. Interpret results using the table
5. Use Clear button for new calculations
Development Process
1. Designed HTML interface
2. Added CSS styling
3. Implemented t-test formula in JavaScript
4. Added input validation
5. Created results display
6. Added statistical reference table
7. Implemented clear functionality
8. Optimized for user experience