## Power Calculator Minimum Sample Size – Testing for One Mean

Instructions: This power calculator computes, showing all the steps, the minimum required sample size ($$n$$) to reach a given target statistical power ($$1-\beta$$), when testing for a one

## Effect Size Calculator for the T-Statistic

Instructions: This effect size calculator for the t-statistic allows you to compute the value of $$r^2$$ (r-squared) if you know the t-statistic ($$t$$) and the number of degrees of freedom ($$df$$):

## Chebyshev’s Rule Calculator

Instructions: This Chebyshev’s Rule calculator will show you how to use Chebyshev’s Inequality to estimate probabilities of an arbitrary distribution. You can estimate the probability

## Empirical Rule Calculator

Instructions: This Empirical Rule calculator will show you how to use the Empirical Rule to compute some normal probabilities. Please type the population mean and population standard deviation, and

## Combinatorial Coefficient Calculator

Instructions: You can use this combinatorial coefficient calculator to compute “n choose k”, or $$C_{n,k}$$, for two given integers $$n$$ and $$k$$. Type the integer $$n$$: Type the

## Calculator of the Factorial of a Number

Instructions: You can use this factorial calculator to compute the factorial of an integer number $$n$$. Type the integer: More about the factorial of a number: There are many Math contexts in which

## Spearman Correlation Calculator

Instructions: You can use this Spearman Correlation Calculator tool to compute Spearman’s Correlation Coefficient for two variables X and Y. All you have to do is type your X and Y data, either

## Pooled Variance Calculator

Instructions: This calculator computes the pooled variance and standard deviation for two given sample standard deviations $$s_1$$ and $$s_2$$, with corresponding sample sizes $$n_1$$ and $$n_2$$.

## Mean and Standard Deviation Calculator

Instructions: Enter the sample data below and the solver will provide step-by-step calculation of the sample mean, variance and standard deviation: Type the sample (comma or space separated) Name of

## Effect Size Calculator – Cohen’s d

Instructions: This Statistics calculator will compute the Cohen’s d for you. Please provide the information required below: Sample Mean ($$\bar X$$) Population Mean ($$\mu$$) Population St.

## Linear Regression Calculator

Instructions: Perform a regression analysis, where the regression equation will be found and a detailed report of the calculations will be provided, along with a scatter plot. All you have to do is

## Gamma Coefficient Calculator

Instructions: This calculator computes the value of Gamma, which measures the strength of the association between two ordinal variables. Please first indicate the number of columns and rows for the

## Lambda Coefficient Calculator

Instructions: This calculator computes the value of Lambda, which measures the strength of the association between two nominal variables. Please first indicate the number of columns and rows for the

## 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

## Odds Ratio Calculator

Instructions: This calculator computes the Odds Ratio (OR) for a 2×2 crosstabulation, which measures the ratio of the odds of exhibiting a condition (or disease) for those in an exposed group,

## Phi Coefficient Calculator

Instructions: This calculator computes the value of the Phi Coefficient. Please first indicate the number of columns and rows for the cross tabulation, and then type the table data: Num. Rows = Num.

## Chi-Square Test for Goodness of Fit

Instructions: This calculator conducts a Chi-Square test for goodness of fit. Please enter the observed data, the hypothesized population proportions (expected proportions) and the significance level

## Chi-Square Test of Independence

Instructions: This calculator conducts a Chi-Square test of independence. Please first indicate the number of columns and rows for the cross tabulation. Then type the table data, the significance

## Cramer’s V Calculator

Instructions: This calculator computes the value of Cramer’s V. Please first indicate the number of columns and rows for the cross tabulation, and then type the table data: Num. Rows = Num.

## Z-test for Two Proportions

Instructions: This calculator conducts a Z-test for two population proportions (p1 and p2), Please select the null and alternative hypotheses, type the significance level, the sample sizes, the

## T-test for two Means – Unknown Population Standard Deviations

This calculator conducts a t-test for two population means ($$\mu_1$$ and $$\mu_2$$), with unknown population standard deviations. This test apply when you have two-independent samples, and the

## 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

## Uniform Probability Calculator

Instructions: Compute uniform distribution probabilities using the solver below. Please type the lower limit $$a$$, the upper limit $$b$$, and define the event for which you want to compute the

## Sign Test Calculator

Instructions: This calculator conducts a Sign Test. Please select the null and alternative hypotheses, enter the number of positives (+) and the number of negatives (-), along with the significance

## Kruskal-Wallis Test Calculator

Instructions: This calculator conducts Kruskal-Wallis Test, which is non-parametric alternative to the One-Way ANOVA test, when the assumptions are not met for ANOVA. The purpose of the test is to

## Wilcoxon Signed-Ranks Calculator

This calculator conducts a Wilcoxon Signed-Ranks for two paired samples. This test applies when you have two samples that are dependent (paired or matched). Please select the null and alternative

## Wilcoxon Rank-Sum Test Calculator

Instructions: This calculator conducts a Wilcoxon Rank Sum test for two independent samples. This test applies when you have two samples that are independent. Please select the null and alternative

## One Way ANOVA Calculator

Instructions: This calculator conducts One-Way ANOVA for a group of samples, with the purpose of comparing the population means of several groups. Please type the sample data for the groups you want

## T-test for Paired Samples

Instructions: This calculator conducts a t-test for two paired samples. This test applies when you have two samples that are dependent (paired or matched). Please select the null and alternative

## Stem-and-Leaf Plot Maker

Instructions:The following graphical tool creates a Stem-and-Leaf on the data you provide in the box below. Type the sample (comma or space separated, press “Enter” for a new sample):

## 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

## Sample Size Required Calculator – Estimating a Population Proportion

Instructions: This calculator finds the minimum sample size required to estimate a population proportion (p) within a specified margin of error. Please select type the the significance level

## 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.

## 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

## Critical Correlation Calculator

Instructions: Enter the sample size $$n$$ and the significance level $$\alpha$$ and the solver will compute the critical correlation coefficient $$r_c$$. Type the sample size ($$n$$): Type the

## Correlation Coefficient Significance

Instructions: Enter the sample correlation $$r$$, sample size $$n$$ and the significance level $$\alpha$$, and the solver will test whether or not the correlation coefficient is significantly

## Correlation Coefficient Calculator

Instructions: You can use this tool to compute Pearson’s correlation coefficient for two variables X and Y. All you have to do is type your X and Y data, either in comma or space separated

## Confidence Interval Calculator for the Mean (Known Population Standard Deviation)

Instructions: This calculator computes a confidence interval for the population mean $$\mu$$, in the case that the population standard deviation $$\sigma$$ is known. Please type the sample mean, the

## Confidence Interval Calculator for the Mean (Unknown Pop. Standard Deviation)

Instructions: This calculator computes a confidence interval for the population mean $$\mu$$, in the case that the population standard deviation $$\sigma$$ is not known, and we use instead the sample

## Critical Chi-Square Values

Instructions: Compute critical Chi-Square values for the Chi-Square distribution using the form below. Please type significance level $$\alpha$$, the number of degree of freedom (df),and indicate the

## Time Series Plot

Instructions: Create a time series plot using the form below. All you have to do is type Y data (and optionally your time stamp). Also, you can add a title a name to the axes. Y data (comma

## Scatter Plot Maker

Instructions: Create a scatter plot using the form below. All you have to do is type your X and Y data. Optionally, you can add a title a name to the axes. X data (comma or space separated) Y data

## Pie Chart Maker

Instructions: The following graphical tool creates a pie chart based on the data you provide in the box below. All you have to do is type your data and the name of the categories. The tool will

## Line Chart Maker

Instructions: Create a line chart plot using the form below. All you have to do is type Y data (and optionally your X labels). Also, you can add a title a name to the axes. Y data (comma or space

## Histogram Maker

Instructions: The following graphical tool creates a histogram based on the data you provide in the boxes below. All you have to do is type your data and also the number of bins (typically between 4

## Box Plot Maker

Instructions: The following graphical tool creates a box plot on the data you provide in the boxes. You can type one or more samples. Please press ‘\’ to start a new sample. Type the

## Bar Chart Maker

Instructions: The following graphical tool creates a bar graph based on the data you provide in the boxes below. All you have to do is type your data and also name of the categories. The tool will

## Calculation of Descriptive Statistics

Instructions: Enter the sample data below and the solver will provide step-by-step calculation of the basic descriptive statistics, such as the mean, median, mode, variance, standard deviation,

## 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

## T-test for One Population Mean

Instructions: This calculator conducts a t-test for one population mean ($$\sigma$$), with unknown population standard deviation ($$\sigma$$), for which reason the sample standard deviation (s) is

## Z-test for One Population Mean

Instructions: This calculator conducts a Z-test for one population mean ($$\mu$$), with known population standard deviation ($$\sigma$$). Please select the null and alternative hypotheses, type the

## T-Distribution Probability Calculator

Instructions: Compute t-distribution probabilities using the form below. Please type the number of degrees of freedom associated to the t-distribution, and provide details about the event you want to

## Critical T-values

Instructions: Compute critical t values for the t-distribution using the form below. Please type significance level $$\alpha$$, number of degrees of freedom and indicate the type of tail

## Critical Z-Values

Instructions: Compute critical z-values for the normal distribution probabilities using the form below. Please type significance level $$\alpha$$, and indicate the type of tail (left-tailed,

## Normal Probability Calculator

Instructions: This online graph maker will compute normal distribution probabilities using the form below, and it also can be used as a normal distribution graph generator. Please type the population 