Note that with a ± 4% margin of error, polls predicted that the Conservatives could expect anywhere from 39% to 47% of the vote, while Labour could expect 29% to 37% of the vote. What do confidence ...

The Dark Side of Confidence Levels. A 95% level of confidence means that 5% of the surveys will be off the wall with numbers that do not make much sense.

Statisticians and others will talk about confidence intervals of 90%, 95%, or even 99% using a range of numbers. A 90% confidence interval would mean there is a 90% chance that the range presented ...

Ordinarily you might see a confidence interval expressed something like this: The average weight loss for people on the new miracle drug was 4.6 pounds, with a 95 percent confidence interval of 2. ...

Confidence intervals are calculated using a mathematical formula that encompasses the sample size, the range of responses and the laws of probability.

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 ...

Statisticians and others will talk about confidence intervals of 90%, 95%, or even 99% using a range of numbers. A 90% confidence interval would mean there is a 90% chance that the range presented ...