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## Z-test for two Means, with Known Population Standard Deviations

Instructions: This calculator conducts a Z-test for two population means ($$\mu_1$$ and $$\mu_2$$), with known population standard deviations ( $$\sigma_1$$ and $$\sigma_2$$). Please select the null and alternative hypotheses, type the significance ...

## Relative Risk Calculator

Instructions: This calculator computes the Relative Risk for a 2×2 crosstabulation, which measures the ratio of the risk of developing a condition (or disease) for those exposed to a risk factor, versus the the risk of exhibiting the condition ...

## F-test for the Equality of Two Population Variances

Instructions: This calculator conducts an F test for two population variances in order to assess whether two population variances $$\sigma_1^2$$ and $$\sigma_1^2$$ can be assumed to be equal or not. Please select the null and alternative hypotheses, ...

## Z-test: One Pop. Proportion

Instructions: This calculator conducts a Z-test for one population proportion (p). Please select the null and alternative hypotheses, type the hypothesized population proportion $$p_0$$, the significance level $$\alpha$$, the sample mean, the ...

## Poisson Probability Calculator

Instructions: Compute poisson probabilities using the form below. Please type the population mean (λ), and provide details about the event you want to compute the probability for: Population mean ($$\lambda$$) Two-Tailed: ≤ X ≤ ...

## Exponential Probability Calculator

Instructions: Compute exponential distribution probabilities using the form below. Please type the population mean $$(\beta)$$, and provide details about the event for which you want to compute the probability for. Notice that typically, the ...