[Module 8] Length of Confidence Interval and Appropriate Sample Size

Confidence Interval

In statistics, this refers to the probability that a Population parameter will fall between a set of values for a certain proportion of times.

Narrowness of the interval

This pertains to a small width in relation to the length of the confidence interval.

Length of Confidence Interval

This refers to the absolute difference between the upper confidence limit and the lower confidence limit.

confidence

the narrowness of the interval.

In deriving the formula for the sample size, there are two things to remember when we decided on the quality of the sample size that we need: ______ and _________

Confidence interval

describes the uncertainty inherent in this estimate and describes a range of values within which we can be reasonably sure that the true effect actually lies.

Narrowness of the interval

pertains to a small width in relation to the length of the confidence interval.

whole number

When the calculated sample size is not a whole number, it should be rounded up to the next higher ______. (ex: 2006.134 = 2007)