Sampling errors are statistical errors that arise when a sample does not represent the whole population once analyses have been undertaken. Sampling bias is the expectation, ...

Day 8 of the Michelle Mone linked PPE Medpro trial saw the government’s statistics expert concede major flaws in gown ...

Consider a population of 70 individuals, for which you wish to estimate the mean annual income, μ. Assume that you have decided to use the following estimation procedure to make your estimate: simple ...

How do I know if a candidate’s lead is ‘outside the margin of error’? News reports about polling will often say that a candidate’s lead is “outside the margin of error” to indicate that a candidate’s ...

Serious polling requires careful data collection and careful adjustment. It doesn't mean much to say your poll is a "probability sample" when your nonresponse rate is 90 percent.

When conducting statistical analyses, economists and researchers seek to reduce sampling bias to a near negligible level. The danger of sampling bias is that it can result in a biased sample of a ...