Graphpad Quickcalcs T Test [hot] -
| User action | System response | |-------------|----------------| | Paste non-numeric text | Highlight offending cells, suggest cleaning. | | Unequal sample sizes | Auto‑use Welch's t‑test, show warning. | | Outliers present | Flag with Grubbs' test (optional checkbox). | | One‑sample test with N<3 | Warn: “Insufficient sample size for reliable inference.” |
┌─────────────────────────────────────────────────────────────┐ │ GraphPad QuickCalcs – Smart t-test │ ├─────────────────────────────────────────────────────────────┤ │ [Raw data] [Summary data] [One-sample] │ │ │ │ Paste Group A: Paste Group B: │ │ ┌──────────────────┐ ┌──────────────────┐ │ │ │ 12.4 │ │ 9.8 │ │ │ │ 13.1 │ │ 8.7 │ │ │ │ 11.9 │ │ 10.2 │ │ │ └──────────────────┘ └──────────────────┘ │ │ │ │ [✓] Check normality & variance equality │ │ │ │ [ Calculate ] │ │ │ │ ⚠️ Assumption check: │ │ • Variances differ (p=0.04) → Using Welch's test. │ │ │ │ 📊 Result: t=2.81, df=28.4, p=0.009 ** │ │ Mean diff = 2.6 (95% CI: 0.7 to 4.5) │ │ Cohen's d = 0.85 (Large) │ │ │ │ [Download report] [Switch to Student's t-test (not rec.)]│ └─────────────────────────────────────────────────────────────┘ graphpad quickcalcs t test
“Based on your data, we used Welch's t‑test because the variances were significantly different (p=0.04). The treatment group (mean 12.3) was significantly higher than control (mean 9.7), t(28.4)=2.8, p=0.009, Cohen's d=0.85 (large effect).” | | One‑sample test with N<3 | Warn:
The is one of the most widely used, free web-based utilities for evaluating whether the means of exactly two groups are statistically different. Designed to eliminate complex software workflows, this tool provides rapid scientific insights directly from your browser. Core Applications of the Tool Designed to eliminate complex software workflows, this tool
| Input Type | Description | |------------|-------------| | | Paste columns of numbers (e.g., from Excel/CSV). Supports up to 2 groups (Group A, Group B). | | Summary Data | Enter N, mean, SD/SEM for each group (for users without raw data). | | One-sample | Enter sample mean, SD, N, and hypothesized population mean. |