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Unformatted text preview: mark of the College Entrance Examination Board. AP® Statistics 2000 ─ Scoring Guidelines
(a) Describes an experimental design that includes:
1. Random assignment of volunteers to the treatment groups
2. Identification of treatment groups as old drug and new drug
3. Indication that a comparison or measurement of cholesterol levels should be
The student may give a detailed diagram that addresses the three parts:
Group 1 Treatment 1
2. (old drug) Group 2 1.
subjects Treatment 2
2. (new drug) 3.
Levels Note: In part (a), it is incorrect to use the terminology “treatment” and “placebo”
for the treatment groups. It is considered correct to use “old drug” and “new
drug”, and “placebo,” if a third group is used, for the treatment groups.
(b) Describes an experimental design that includes:
1. Creating blocks based on level of exercise or cholesterol level, or
creating blocks using age, diet, gender, or any other factor plausibly
related to cholesterol level with explanation (i.e., block on gender
because males and females may respond differently)
2. Random assignment of subjects to treatments within blocks
The student may give a detailed diagram that addresses the two parts as
long as the blocking factor is described. Block 1
Block 1 Block 2
(No exercise) Random
Block 2 Volunteers Treatment 1
(new drug) Compare
Levels Note: No credit will be given in part (b) if a student does not use blocking in
his/her design even though they randomize correctly.
Note: Crossover designs or matched-pairs designs that incorporate the
idea of blocking are acceptable.
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