A medical team is testing the effectiveness of Colaziprid, a new drug designed to reduce the length of symptoms for cold and flu sufferers. The team develops three types of tablets: a placebo, a low dose of Colaziprid, and a high dose of Colaziprid, making sure that all tablets look and taste the same. The team also wants to test the effectiveness of Vitamin C in reducing the length of cold and flu symptoms. So the team develops an identically looking and tasting placebo for Vitamin C tablets also.

A group of 120 cold sufferers that show similar severity of symptoms are randomly separated into 6 groups. The groups are treated as follows:

• Group 1 - placebo for Colaziprid, placebo for Vitamin C
• Group 2 - placebo for Colaziprid, real dose of Vitamin C
• Group 3 - low dose of Colaziprid, placebo for Vitamin C
• Group 4 - low dose of Colaziprid, real dose of Vitamin C
• Group 5 - high dose of Colaziprid, placebo for Vitamin C
• Group 6 - high dose of Colaziprid, real dose of Vitamin C

The length of cold symptoms is measured for each cold sufferer.

A)This testing procedure is an example of an:

1) experiment that does not make use of blocking or blinding

2) experiment that makes use of blocking

3) experiment that makes use of blinding

B)The subject(s) of this experiment:

1) are the cold sufferers

2) is Colaziprid

C)Identify factor(s) of this experiment:

1) whether or not someone has a cold at the beginning of the experiment

2) the length of cold symptoms over the course of the experiment

3) amount of Colaziprid

4) application of Vitamin C

D) Identify the response in the experiment:

1) whether or not someone has a cold at the beginning of the experiment

2) the length of the cold symptoms over the course of the experiment

3) the amount of Colaziprid consumed

4) whether or not Vitamin C was consumed