Confidence intervals are a standard output of many free and paid A/B testing tools. Most A/B test reports contain one or more interval estimates. Even if you’re simply a consumer of such reports, ...

Third in the series: Nobody becomes a Psych major to study statistics The science of uncertainty. Statistics – much to the regret of many potential psych majors – is the core methodology that links ...

In this example, the capability index C pk is computed for the amplification data in AMPS. To examine the accuracy of this estimate, the following statements calculate a 90% confidence interval for C ...

This applet allows users to drag sliders to change the confidence level and sample size. The applet helps users visualize the meaning of the phrase "C% confidence," by showing that C% of the samples ...

I've become alarmed recently at the number of young engineers (i.e. those with less than 5 years of work experience), who seem to have missed the college course on applied probability and don't know ...

Some families of distributions are presented for which certain Neyman confidence intervals have very poor conditional properties. In each case there is a 50% Neyman confidence interval I(x) for a ...

Under an answer-until-correct scoring procedure, many measurement problems can be solved when certain cognitive models of examinee behavior can be assumed (Wilcox, 1983). Point estimates of true score ...