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...

Instructions: This power calculator computes, showing all the steps, the probability of making a type II error (\(\beta\)) and the statistical power (\(1-\beta\)) when testing...

In our grandparents’ day, school demands consisted of the three Rs – reading, writing and arithmetic. That was all anybody every really needed to know,...

Instructions: This percentile calculator for grouped data will calculate a percentile you specify, showing step-by-step, for the grouped sample data set provided by you in...

Instructions: This calculator of descriptive statistics for grouped data calculates the sample mean, variance and standard deviation for grouped data. Grouped data is specified in...

Instructions: This percentile calculator will calculate a percentile you specify, showing step-by-step, for a sample data set provided by you in the form below: Type...

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...

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...

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...