Calculate the margin of error of a confidence interval for the difference between two population means using the given information. Round your answer to six decimal places. σ1=9.56σ1=9.56, n1=84n1=84, σ2=12.6σ2=12.6, n2=100n2=100, c=0.9

Answer the whole page for number six please.

Use the formula to find the standard error of the distribution of differences in sample means, ₁ - ₂. Samples of size 23 from Population 1 with mean 6.5 and standard deviation 3.4 and samples of size 40 from Population 2 with mean 7.9 and standard deviation 6.6 Round your answer for the standard error to two decimal places. standard error = PI

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=28.1σ=28.1. You would like to be 98% confident that your esimate is within 3 of the true population mean. How large of a sample size is required?n =

A random sample of 15 exam scores showed a standard deviation of 6.0 points. Find the 95 percent confidence interval for the population standard deviation. Use Appendix E to obtain the values of  χ2LχL2 and χ2UχU2 . (Round your answers to 2 decimal places.) The 95% confidence interval is from ______ to __________  .

A simple random sample of size n = 40 is drawn from a population. The sample mean is found to be x = 120.8 and the sample standard deviation is found to be s = 12.8. Construct a 99% confidence interval for the population mean. The lower bound is . (Round to two decimal places as needed.) D Clear all Check answer View an example Help me solve this 79°F 11:36 PM 6/17/2022 Type here to search 7 '7 + E 4 R F 96 5 T B O 9 0 H 7 N Get more help. hp 1 8 1 K P O ( prt sc C

Express the confidence interval (72.5%,86.7%) in the form of ˆp±ME_______% ± ________ %