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