A research laboratory was developing a new compound for the relief of severe cas

Question

A research laboratory was developing a new compound for the relief of severe cases of hayfever. The amounts of two active ingredients (low. medium. high) in the compound were variedat three levels each using 18 volunteers. Randomization was used in assigning volunteers toeach of the treatment combination~. Data were collected on hour~ of relief. a. Is this study experimental, observational, or mixed? Why? b. Identify all factors, factor levels, and factor-level combinations. c. What type of study design is being implemented here? d. What is the basic unit of study? A research laboratory was developing a new compound for the relief of severe cases of hayfever. The amounts of two active ingredients (low. medium. high) in the compound were variedat three levels each using 18 volunteers. Randomization was used in assigning volunteers toeach of the treatment combination~. Data were collected on hour~ of relief. a. Is this study experimental, observational, or mixed? Why? b. Identify all factors, factor levels, and factor-level combinations. c. What type of study design is being implemented here? d. What is the basic unit of study? a. Is this study experimental, observational, or mixed? Why? b. Identify all factors, factor levels, and factor-level combinations. c. What type of study design is being implemented here? d. What is the basic unit of study? a. Is this study experimental, observational, or mixed? Why? b. Identify all factors, factor levels, and factor-level combinations. c. What type of study design is being implemented here? d. What is the basic unit of study?

Explanation / Answer

a)

Experimental study since all three levels of treatment are controlled and randomly distributted among 18 volunteers.

b)

Factor 1: ingredient 1, with three levels (low, medium, high) ; Factor 2: ingredient 2, with three levels (low, medium, high) ; There’re 3 * 3 = 9 combinations.

c)

Completely randomized design

d)

Volunteer

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