Chapter 9 (Comparing Two Population Means)

Question 1

What is a two-sample problem?

Answer 1

When comparing the means of two groups, and a researcher has two sets of data observations.

Question 2

What is a paired two-sample problem?

Answer 2

When the two populations are dependent or related to each other

Question 3

What is an independent two-sample problem?

Answer 3

When both populations are independent.

Question 4

When can we use the general independent procedure?

Answer 4

We always can as long as we have two independent samples.

Question 5

When can we use the pooled independent procedure?

Answer 5

If the variances of the two populations are “equal”. (larger one / smaller one ≤ 1.5)

Question 6

What is the point estimate for an independent two-sample problem?

Answer 6

x_bar - y_bar

Question 7

For paired samples, our data simplifies to…

Answer 7

z_i = x_i - y_i