Compare calculators

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

Chi-Square Test Calculator

Calculate the chi-square (χ²) test statistic and compare it against a critical value to test goodness of fit or independence. Used in research, biology, marketing, and quality control.

Observed Frequency 1

Expected Frequency 1

Observed Frequency 2

Expected Frequency 2

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Probability

Hypothesis Test Calculator

Run a one-sample z-test or t-test to determine whether a sample mean significantly differs from a hypothesized population mean. Essential for quality control, clinical trials, and academic research.

Sample Mean

Hypothesized Mean (μ₀)

Sample Standard Deviation

Sample Size (samples)

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Key differences

	Chi-Square Test Calculator	Hypothesis Test Calculator
Category	Probability	Probability
Inputs required	4	4
Result	Chi-Square Statistic	Test Statistic
What it does	Calculate the chi-square (χ²) test statistic and compare it against a critical value to test goodness of fit or independence. Used in research, biology, marketing, and quality control.	Run a one-sample z-test or t-test to determine whether a sample mean significantly differs from a hypothesized population mean. Essential for quality control, clinical trials, and academic research.