l Chapter 9- Learning objectives Explain the difference between a point and an interval estimate Construct and interpret confidence intervals. with a z for the population mean or proportion with a t for the population mean Determine appropriate sample size to achieve specified levels of accuracy and confidence o 2002 The Wadsworth GroupChapter 9 - Learning Objectives • Explain the difference between a point and an interval estimate. • Construct and interpret confidence intervals: – with a z for the population mean or proportion. – with a t for the population mean. • Determine appropriate sample size to achieve specified levels of accuracy and confidence. © 2002 The Wadsworth Group