If the P value is less than 5%, reject the null hypothesis; if the P value is .05 or more, don't reject the null hypothesis. Statistics textbooks -- and statisticians for that matter -- focus almost ...

At times we wish to examine statistical evidence, and determine whether it supports or contradicts a claim that has been made (or that we might wish to make) concerning the entire population. This is ...

Did you ever wonder why 19th century pirates are often represented wearing eye patches? I never did, because I assumed that it was for the obvious reason: they had lost an eye. Pirates, like many ...

The problem of testing a point null hypothesis (or a "small interval" null hypothesis) is considered. Of interest is the relationship between the P value (or observed significance level) and ...

Hypothesis testing problems in which the null hypothesis is simple, the parameter space is finite dimensional and the supports of the probability measures are independent of the parameter are ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

An excellent post by my colleague John Nielsen-Gammon, the Texas State climatologist, can be found here. An excerpt: … consider a pot of water. Somebody you don’t know claims that they have invented a ...

Researchers from Northwestern University, University of Pennsylvania, and University of Colorado published a new Journal of Marketing study that proposes abandoning null hypothesis significance ...