Guide to Using Excel 2007 For Basic Statistical Applications To Accompany Business Statistics: A Decision Making Approach, 8th Ed. Chapter 8: Estimating Single Population Parameters By Groebner, Shannon, Fry, & Smith Prentice-Hall Publishing Company Copyright, 2011

Chapter 8 Excel Examples Interval Estimation - Interval Estimation - Interval Estimation - Interval Estimation - Nagel Beverage Company Interval Estimation Using the t-distribution - Interval Estimation Using the t-distribution - Interval Estimation Using the t-distribution - Interval Estimation Using the t-distribution - Heritage Software

Interval Estimation- Nagel Beverage Company Issue: The manager is interested in estimating the mean fill amount in soft-drink cans. Ideal average is 12 ounces Objective: Use Excel 2007 to help construct a confidence interval estimate for population mean fill volume. Data file is Nagel-Beveragea.xls

Interval Estimation – Nagel Beverage Open file Nagel-Beveragea

Interval Estimation – Nagel Beverage First Step is to develop a histogram for the sample data. Define Bins (upper limit of each class

Interval Estimation – Nagel Beverage Select the Data tab Select Data Analysis Select Histogram

Interval Estimation – Nagel Beverage Set Input Range to the contents of the Ounces column Set Bin Range to the contents of the bins Select New Worksheet (Optional) Select Chart Output

Interval Estimation – Nagel Beverage This is the formatted histogram – See the Capital Credit Union example in Chapter 2 for the specific steps used to format the histogram

Interval Estimation - Heritage Software Issue: The company has service representatives who answer calls from customers. The managers are interested in estimating the mean call time Objective: Use Excel 2007 to help construct a confidence interval estimate for population mean call time. Data file is Heritage.xls

Interval Estimation – Heritage Software Open file Heritage.xls The file contains 25 entries

Interval Estimation – Heritage Software Select the Data tab Select Data Analysis Select Descriptive Statistics

Interval Estimation – Heritage Software 95% Confidence interval = /

Interval Estimation – Heritage Software Select Add-Ins Tab Select PHStat Select Confidence Intervals Select Estimate for the Mean, sigma unknown

Interval Estimation – Heritage Software Confidence Level = 95% Select Sample Statistics Unknown Sample Cell Range = A1:A25 OK

Interval Estimation – Heritage Software PHStat Output