Chapter 9 (Comparing Two Population Means) Flashcards
1
Q
What is a two-sample problem?
A
When comparing the means of two groups, and a researcher has two sets of data observations.
2
Q
What is a paired two-sample problem?
A
When the two populations are dependent or related to each other
3
Q
What is an independent two-sample problem?
A
When both populations are independent.
4
Q
When can we use the general independent procedure?
A
We always can as long as we have two independent samples.
5
Q
When can we use the pooled independent procedure?
A
If the variances of the two populations are “equal”. (larger one / smaller one ≤ 1.5)
6
Q
What is the point estimate for an independent two-sample problem?
A
x_bar - y_bar
7
Q
For paired samples, our data simplifies to…
A
z_i = x_i - y_i
