4.2.B—Identify an appropriate confidence interval procedure including the parameter for a population mean or…

Identify an appropriate confidence interval procedure including the parameter for a population mean or population mean difference.

• The appropriate confidence interval procedure for estimating the population mean of a quantitative variable for one sample is a one-sample t-interval for a population mean. (The population standard deviation, σ, is not typically known for distributions for quantitative variables.)
• For a matched pairs design with two dependent samples, the appropriate analysis calculates differences between pairs of values to produce one sample of differences. The confidence interval procedure for the matched pairs design is a one-sample t-interval for a population mean difference.
• The parameter for a confidence interval for a population mean or population mean difference should reference the population mean or population mean difference and the response variable, in context. For the population mean difference, it is important to state the order of subtraction for the difference.