MGMT 650 Quiz 8 Answers (2020) UMUC.docx

• mean 81
• population variance 2
• sample size 50
Note that the population variances are known. Test H0: (population1 mean - population2 mean) ≤ 0 at α =
0.05. HA: (population1 mean - population2 mean) > 0. This is a one-tailed test with upper reject region
and positive critical value.
13. The results of sampling independent populations:
sample 1 from population 1
• mean 1000
• sample standard deviation 400
• sample size 50
sample 2 from population 2
• mean 1250
• sample standard deviation 500
• sample size 75
Test the H0: population1 mean = population2 mean at α = 0.01. HA: population1 mean ≠ population2
mean. This is a two-tailed test with both a negative lower critical value and a positive upper critical value.
Separate variances is assumed.