Does Saint-John\'s-wort relieve major depression? Here are some excerpts from th

Question

Does Saint-John's-wort relieve major depression? Here are some excerpts from the report of a study of this issue. The study concluded that the herb is no more effective than a placebo. (a) "Design: Randomized, double blind, placebo-controlled clinical trial..."Explain the meaning of each of the terms in this description. (b) "Participants ... were randomly assigned to receive either Saint-John's-wort extract (n = 98) or placebo (n = 102)... The primary outcome measure was the rate of change in the Hamilton Rating Scale for Depression over the treatment period. "Based on this information, use a diagram to outline the design of this clinical trial. Marketing to children If children are given more choices within a class of products, will they tend to prefer that product to a competing product that offers fewer choices? Marketers want to know. An experiment prepared three "choice sets" of beverage. The first contained two milk drinks and two fruit drinks. The second had the same two fruit drinks but four milk drinks. The third contained four fruit drinks but only the original two milk drinks. The researchers divided 210 children aged 4 to 12 years into 3 groups at random. They offered each group one of the choice sets. As each child a beverage to drink from the choice set presented, the researchers noted whether the choice was a milk drink or a fruit drink. (a) What are the experimental units or subjects? (b) What is the factor, and what are its levels? (c) What is the response variable? (d The children's choice experiment has 210 subjects Explain how you would assign labels to the 210 children in the actual experiment. Then use Table B at line 125 to choose only the first 5 children assigned to the first treatment.

Explanation / Answer

Solution:-

Ans (a): -

Childrens are the experimerntal unit .

Because, The experimental unit is the physical entity which can be assigned, at random, to a treatment and in this case we assigned random treatment on childrens.

Ans (b): -

Factor: Milk drink and Fruit drink are the factor in this experiment.

Level: Age froups are level for this experiment.(Age grouss are 4 to 12)

Ans (c): -

" Choice of beverages" is respone variable.

A variable which is measured or observed is called respone variable.

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