1. the purpose of blocking is to: a. arrange experimental units according to sim
ID: 3327260 • Letter: 1
Question
1. the purpose of blocking is to:
a. arrange experimental units according to similarity.
b.ensure that the results from an experiment are accurate.
c. control the effects of an outside variable that is not of interest to the researchers.
d. All of the above.
2. In a study of human development, investigators showed two movies that were different types to groups of children. Crackers were available in a bowl, and the investigators compared the number of crackers eaten by children watching both movies. One movie was shown at 8 AM (right after the children had breakfast) and the other at 11 AM (right before the children had lunch). It was found that during the movie shown at 11 AM, more crackers were eaten than during the movie shown at 8 AM. The investigators concluded that the different types of movies had different effects on appetite. Reference: Ref 9-3 The treatment in this experiment is
A. the number of crackers eaten.
B. the different kinds of movies.
C. the time each movie was shown.
D. the bowls.
Explanation / Answer
1. Correct option:
d. All the above
EXPLANATION:
The purpose of blocking is (i) arrange experimental units according to similarity, (ii) ensure results are accurate and (iii) control effects of outside variable that is not of interest to thye researchers.
2. Correct option:
B. the different types of movies
EXPLANATION:
Treatment is defined as combnation of factor levels. Here, the researcher is interested in the effect of different kinds of movies on the appetite.
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