Confidence Interval Calculator | confidence interval p value calculator
Thissimpleconfidenceintervalcalculatorusesatstatisticandsamplemean(M)togenerateanintervalestimateofapopulationmean(μ).Theformulaforestimationis: μ=M±t(sM) where: M=samplemeant=tstatisticdeterminedbyconfidencelevelsM=standarderror=√(s2/n)Asyoucansee,toperformthiscalculationyouneedtoknowyoursamplemean,thenumberofitemsinyoursample,andyoursamplesstandarddeviation.(Ifyouneedtocalculatemeanandstandarddeviationfromasetofrawscores,youcandosousingourdescriptivestatisticstools[1].)TheCalcu...
This simple confidence interval calculator uses a t statistic and sample mean (M) to generate an interval estimate of a population mean (μ).
The formula for estimation is:
μ = M ± t(sM)
where:
M = sample meant = t statistic determined by confidence levelsM = standard error = √(s2/n)
As you can see, to perform this calculation you need to know your sample mean, the number of items in your sample, and your samples standard deviation. (If you need to calculate mean and standard deviation from a set of raw scores, you can do so using our descriptive statistics tools[1].)
The Calculation
Please enter your data into the fields below, select a confidence level (the calculator defaults to 95%), and then hit Calculate. Your result will appear at the bottom of the page.
Please enter your values above, and then hit t...
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P-value Calculator
Powerful p-value calculator online: calculate statistical significance using a Z-test ... A/B testing) it is reported alongside confidence intervals and other estimates.