Ch 8 - Interval Estimation

Margin of Error

The + or - value added to and subtracted from a point estimate in order to develop an interval estimate of a population parameter

T distribution

A family of probability distributions that can be used to develop an interval estimate of a population mean whenever the population standard deviation is unknown and is estimated by the sample standard deviation

Degrees of Freedom

A parameter of the T distribution. When the t distribution is used in the computation of an interval estimate of a population mean, the approximate t distribution has n-1 _____, where n is the size of the sample

Confidence coefficient

A probability associated with a confidence interval that expresses the probability that the interval will include the parameter value under study.

Confidence level

The level of certainty that a population parameter exists in the calculated confidence interval.

Interval Estimate

an estimate of a population parameter that provides an interval of values believed to contain the value of the parameter is known as the