b. Cannot assume that s 1 = s 2
Problem: What degrees of freedom to use?
Lecture 17:
1. Difference of Means Test (t-test), part II
b. Cannot assume that s 1 = s 2
Problem: What degrees of freedom to use?
2. Using Stata for:
Single Sample Z test
Single Sample t test
Confidence intervals
Difference of means test: equal and unequal variance