Title: Confidence Level: What is it? - Statistics How To
Headings: Confidence Level: What is it?
Confidence Level: What is it?
Share on
Real Life Example
What about “+/- 3 percentage points”?
Factors that Affect Confidence Intervals (CI)
0% and 100% Confidence Level
Confidence Coefficient
References

Content: In this case, you would expect the results to be 35 (38-3) to 41 (35+3) percent, 95% of the time. Factors that Affect Confidence Intervals (CI)
Population size: this does not usually affect the CI but can be a factor if you are working with small and known groups of people. Sample Size: the smaller your sample, the less likely it is you can be confident the results reflect the true population parameter. Percentage: Extreme answers come with better accuracy. For example, if 99 percent of voters are for gay marriage, the chances of error are small. However, if 49.9 percent of voters are “for” and 50.1 percent are “against” then the chances of error are bigger. 0% and 100% Confidence Level
A 0% confidence level means you have no faith at all that if you repeated the survey that you would get the same results.