Test-4 Progress sa Score: 11.25/45 4/15 answered Question 5 Two samples are taken with the following sample means, sizes, and standard deviations 21 = 31 12 = 20 n1 = 74 no = 71 81 = 3 82 = 4 Estimate the difference in population means using a 95% confidence level. Use a calculator, and do NOT pool the sample variances. Round answers to the nearest hundredth. I