T-Test Calculator for a Single Sample
This calculator performs a one-sample t-test to determine whether your sample mean is significantly different from a known or hypothesized population mean.
When to Use
Use the one-sample t-test when you want to compare the mean of a single sample to a known or hypothesized population value.
Examples
- Testing if class average differs from national average
- Checking if product ratings differ from expected value
- Comparing treatment group to historical control
Requirements
- Sample is randomly selected
- Data is approximately normally distributed
- Population standard deviation is unknown
Null Hypothesis
H₀: μ = μ₀ (sample mean equals population mean)