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Chapter 5: Statistical Inference (part 2) - Coggle Diagram
Chapter 5:
Statistical Inference (part 2)
Two Sample Hypothesis Tests
Comparing two populations for differences in means, proportions or other population parameters
ex:-confirm differences between suppliers
-effect of two medications on curing an illness
Dependent vs. Independent Sample
independent
Samples are selected at random
The scores of one samples does not affect the other
Waiting time in Hospital A vs Hospital B
dependent
Samples are related to each other
Occur in two scenarios (post test and pre test/ before and after)
Scores on a test before and after the lesson
Two sample test for mean/Independent group
One tailed test (Lower-tailed)
H0 : µ1 - µ2 > 0
H1 : µ1- µ2 < 0
One tailed test (upper-tailed)
H0 : µ1 - µ2 < 0
H1 : µ1- µ2 > 0
Two tailed test
H0 : µ1 - µ2 = 0
H1 : µ1- µ2 ≠ 0