3.) You are setting up a paired study. There are 2 treatments. You want to block

Question

3.) You are setting up a paired study. There are 2 treatments. You want to block OUT the effect of initial weight. The first experimental unit you pick for a block has an initial weight of 20 grams. Which of the following would be the best choice (given your goals) for a 2nd experimental unit in the same block? A.) 24 B.) 19 4.) True or False: Paired studies are a type of block design with only 2 treatments 5.) True or False: For the Paired t-test all experimental units (both within and among blocks) are independent from each other 6.) Determine whether the following is an example of an independent (Completely Randomized Design) or dependent (Blocked Design) study: The accuracy of verbal responses is tested in an experiment in which subjects report their weights verbally, this weight is recorded, and then the same person is weighed on a physician's scale and the actual weight is recorded for comparison. A.) CRD Study B.) Block Study 7-) Determine whether the following is an example of an independent (Completely Randomized Design) or dependent (Blocked Design) study: The effectiveness of Prilosec for treating heartburn is tested by measuring gastric acid secretions in each patient before and again after drug treatment. A.) CRD Study B.) Block Study 8.) True or False: Twin studies are analyzed using a 2-sample t-test

Explanation / Answer

Question 4.

Solution:

This statement is True.

Explanations:

A matched pairs design is a special case of a randomized block design. It can be used when the experiment has only two treatment conditions; and subjects can be grouped into pairs, based on some blocking variable. Then, within each pair, subjects are randomly assigned to different treatments.

Question 6.

Solution:

The accuracy of verbal responses is tested in an experiment in which subjects report their weights verbally, this weight is recorded, and then the same person is weighed on a physician's scale and the actual weight is recorded for comparison.

This is an example of Block Study.

Explanation:

If an experimenter is aware of specific differences among groups of subjects or objects within an experimental group, researcher may prefer a randomized block design to a completely randomized design. In a block design, experimental subjects are first divided into homogeneous blocks before they are randomly assigned to a treatment group.

Question 7.

Solution:

The effectiveness of Prilosec for treating heartburn is tested by measuring gastric acid secretions in each patient before and again after drug treatment.

This is an example of Block Study.

With a randomized block design, the experimenter divides subjects into subgroups called blocks, such that the variability within blocks is less than the variability between blocks. Then, subjects within each block are randomly assigned to treatment conditions. Compared to a completely randomized design, this design reduces variability within treatment conditions and potential confounding, producing a better estimate of treatment effects.

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