1. 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

2. 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

3. 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

4. Interval Estimation – Nagel Beverage Open file Nagel-Beveragea

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

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

7. 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

8. 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

9. 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

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

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

12. Interval Estimation – Heritage Software 95% Confidence interval = 7.088 +/- 1.915 5.173 ---------------- 9.003

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

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

15. Interval Estimation – Heritage Software PHStat Output