The most commonly used level of confidence when calculating a confidence interval is:
A)68%
B)90%
C)95% or 99%
D)100%
E)none of the above; there can be no confidence since we are dealing with statistics

Question

Quizplus · Accepted Answer

The most commonly used level of confidence when calculating a confidence interval is either 95% or 99%. A 95% confidence level means that if we were to repeat the sampling process multiple times, we would expect the true population parameter (mean, proportion, etc.) to fall within the calculated interval about 95% of the time. This level of confidence is considered to be statistically significant and commonly used in many fields of research. While higher levels of confidence, such as 99%, may be used in some cases, they can result in wider confidence intervals and require larger sample sizes to achieve.

The Most Commonly Used Level of Confidence When Calculating a Confidence