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Two independent random samples are taken from two
Chapter 8, Problem 93SE(choose chapter or problem)
Problem 93SE
Two independent random samples are taken from two populations. The results of these samples are summarized in the following table:
a. Form a 90% confidence interval for (μ1 – μ2).
b. Test H0: (μ1 – μ2) = 0 against Use α = .01.
c. What sample size would be required if you wish to estimate (m1 - m2) to within .2 with 90% confidence? Assume that n1 = n2.
Sample 1 |
Sample 2 |
|
n1 = 135 = 12.2 s21= 2.1 |
n2 = 148 = 8.3 s22= 3.0 |
V
Questions & Answers
QUESTION:
Problem 93SE
Two independent random samples are taken from two populations. The results of these samples are summarized in the following table:
a. Form a 90% confidence interval for (μ1 – μ2).
b. Test H0: (μ1 – μ2) = 0 against Use α = .01.
c. What sample size would be required if you wish to estimate (m1 - m2) to within .2 with 90% confidence? Assume that n1 = n2.
Sample 1 |
Sample 2 |
|
n1 = 135 = 12.2 s21= 2.1 |
n2 = 148 = 8.3 s22= 3.0 |
V
ANSWER:Step 1 of 3
a) 90% Confidence interval for 
