Author Question: Using an independent-measurest, the 90 confidence interval for the difference between two population ... (Read 50 times)

magmichele12 · **on:** Jun 20, 2018

Using an independent-measurest, the 90 confidence interval for the difference between two population means ranges from 19 to 23 . Based on this confidence interval, how big is the difference between the two sample means?

a. 4 points c. 21 points
b. 19 points d. 23 points

Question 2

Two separate samples are being used to estimate the population mean difference between two treatment conditions. Which of the following would produce the widest confidence interval?

a. n1 = n2 = 10 with a pooled variance of 10
b. n1 = n2 = 10 with a pooled variance of 100
c. n1 = n2 = 20 with a pooled variance of 10
d. n1 = n2 = 20 with a pooled variance of 100