A researcher wants to estimate the difference in the means of two populations. A random sample of 36 items from the first population results in a sample mean of 430 with a sample standard deviation of 120. A random sample of 49 items from the second population results in a sample mean of 460 with a sample standard deviation of 140. From this information, a 95% confidence interval for the difference in population means is?© BrainMass Inc. brainmass.com June 3, 2020, 6:43 pm ad1c9bdddf
(ux - uy) - (x - y ) / √(σx ^2/n1 + σy^2/n2) ~Z(1,0)
P[ |(ux - uy) - (x - y ) / √(σx ...
This solution helps with questions about confidence interval of means.