An inspector tested the weights of one-pound packages of hamburger twice. Each time, 40 random packages were tested. The mean was 1.08 for both samples, but the first sample had a standard deviation of 0.2 and the second sample had a standard deviation of 0.5. The inspector found the 95% confidence level for both samples. The first sample, with a standard deviation of 0.2, had a confidence interval of The second sample, with a standard deviation of 0.5, had a confidence interval of. Confidence Level z-value (as a percent) 90 90 1.645 95 1.960 99 99 2.576 First sample: 1.03 to 1.13. Second sample: 0.95 to 1.21. First sample: 0.95 to 1.21. Second sample: 1.03 to 1.13. First sample: 1.018 to 1.14. Second sample: 0.925 to 1.24. First sample: 0.925 to 1.23. Second sample: 1.018 to 1.14.