Data Difference between means (hypothesis), M, - H,= 0 Meaning threshold a= 0.05 Sample #1 Sample size n 65 Sample mean 25000 Estimated population standard deviation 8000 Sample #2 Sample size n 55 Sample mean Estimated 22000 population standard deviation 5000 Intermediate Calculations Sample standard deviation 1199.6503 Sampling difference 3000 Z-statistic 2.5007 Bilateral test Lower critical value (Zc.) -1.960 Upper critical value (Zc,) 1,960 Lower Critical Value (Sample Difference) -2351.271 Upper Critical Value (Sample Difference) Descriptive 2351,271 Threshold - Op