The document describes how to take stratified random samples from a population using Excel. It discusses stratifying a population of 1,000 credit card holders into three age groups and taking a sample of 100 distributed proportionally among the groups. The sample is generated by sorting each age stratum by random number and selecting the top sample sizes. Summary statistics are then calculated for each stratum.

2. Example 8.1 Selecting a Sample of Families to Analyze Annual Incomes Methods for Selecting Random Samples

3. Objective To illustrate how Excel’s random number function, RAND, can be used to generate simple random samples.

5. Data

10. Results

12. Example 8.2 Sampling from Accounts Receivable at Spring Mills Company Methods for Selecting Random Samples

13. Objective To illustrate StatPro’s method of choosing simple random samples, and how the associated data can be found with Excel’s lookup functions.

15. Generated Random Sample

20. Example 8.3 Stratified Sampling from the Smalltown Population of Sears Credit Card Holders Methods for Selecting Random Samples

21. Objective To illustrate how stratified sampling, with proportional sample sizes, can be implemented in Excel.

27. Stratified Sample