Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Hypothesis Testing Calculator

Run a one-sample t-test to decide whether a sample mean differs significantly from a hypothesised population mean. Returns 1 (reject the null hypothesis) or 0 (fail to reject) at your chosen confidence level using the one-sample t-statistic and a critical-value lookup.

Sample Mean

Population Mean (H₀)

Sample Standard Deviation

Sample Size

Test Type

Confidence Level

Fill in the required fields to see your result.

Probability

Confidence Interval Calculator

Computes the range of values likely to contain a true population mean at your chosen confidence level. Use it when reporting survey results, clinical trial outcomes, or any estimate derived from a sample.

Sample Mean

Sample Standard Deviation

Sample Size (n) (observations)

Confidence Level

Distribution Type

Fill in the required fields to see your result.

Key differences

	Hypothesis Testing Calculator	Confidence Interval Calculator
Category	Probability	Probability
Inputs required	6	5
Result	Reject Null Hypothesis	Margin of Error (±)
What it does	Run a one-sample t-test to decide whether a sample mean differs significantly from a hypothesised population mean. Returns 1 (reject the null hypothesis) or 0 (fail to reject) at your chosen confidence level using the one-sample t-statistic and a critical-value lookup.	Computes the range of values likely to contain a true population mean at your chosen confidence level. Use it when reporting survey results, clinical trial outcomes, or any estimate derived from a sample.