Question

A study to compare two methods of preserving wood started with boards of southern white pine. Each board was ripped from end to end to form two edge-matched specimens. One was assigned to Method A, the other to Method B.
1. What is the name for each of these study designs?
A) A block design.B) A matched pairs design.C) A probability sampling design.D) A stratified random sample design.

Answer 1

Answer:

B) A matched pairs design.

Because we satisfy the condition of randomized block design. We just have two treatment conditions (Method A and B) and the information can be grouped by pairs and the researcher define a blocking variable. And all the subjects are randomly assigned to the treatments.

Step-by-step explanation:

For this case we want to compare two methods preserving wood started with boards of southern white pine.

Let's analyze one by one the possible options for this case:

A) A block design.

False. In order to satisfy a block design we need to satisfy a placebo condition at some level, and that's not the case.

B) A matched pairs design.

Because we satisfy the condition of randomized block design. We just have two treatment conditions (Method A and B) and the information can be grouped by pairs and the researcher define a blocking variable. And all the subjects are randomly assigned to the treatments.

C) A probability sampling design.

False. That's a a method for select the sample but is not appropiate used when we want to select a design

D) A stratified random sample design.

False. That's a a method for select the sample but is not appropiate used when we want to select a design

Answer 2

Answer:

A) A block design.

Step-by-step explanation:

For a block design, the random assignment of units to treatments is carried out separately within each block. Considering the study in the given question, the study can be divided into two blocks Method A and Method B. The assignment of the preservative is applied to each board to compare the two methods of preserving wood.