1. T08-01 - 1 T08-01 1 Population Sample Size Calculations Purpose Allows the analyst to analyze the sample size necessary to conduct "statistically significant" testing for sample mean and proportion situations for a 1-  confidence level and "allowable error". Inputs Confidence level Margin of error Population/Sample standard deviation Outputs Sample size

2. T08-01 - 2 - 3sd -2sd -1sd + 1sd + 2sd + 3sd Margin of Error - MeansMargin of Error - Proportions Determining How Many Samples to Take Level of Confidence Depends on the level of confidence (1-  )?

3. T08-01 - 3 Sample Size for Mean - Example Calculate the sample size necessary to ensure that you are 95% confident that the error is within 2 of the population mean when the population standard deviation is 6.82.

4. T08-01 - 4 Input the confidence level (.XX for XX%), Std Dev, and Margin of Error. The Sample Size necessary to achieve this accuracy is automatically calculated.

5. T08-01 - 5 Sample Size for Proportion - Example Calculate the sample size necessary to ensure that you are 95% confident that the error is within.10 of the population proportion when the sample population proportion is.80.

6. T08-01 - 6 Input the confidence level (.XX for XX%), proportion, and Margin of Error. The Sample Size necessary to achieve this accuracy is automatically calculated.