An Investigator Conducts an Experiment Involving the Effects of Three

question 111

Multiple Choice

An investigator conducts an experiment involving the effects of three levels of a drug on memory. Subjects are randomly assigned to one of three conditions. A different drug level is administered in each condition. Memory is measured 10 minutes after each subject receives the drug. The following scores are recorded. The higher the score, the better the memory. Assume you are doing post hoc testing between drug levels 2 and 3 using the Scheff test. Given the following values obtained from the ANOVA: , , , n ₁ = n ₂ = n ₃ = 4, k = 3, df _between = 2, df _within = 9, MS_within = 6.639, the value of SS _{between ( groups i and j)} = _________.

• A) 78.125
• B) 66.125
• C) 0.5000
• D) 69.125

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Definitions:

Cerebral Cortex

The outer layer of the brain's cerebrum, playing a key role in memory, attention, perception, cognition, awareness, thought, language, and consciousness.

Brainstem

The lower extension of the brain where it connects to the spinal cord, overseeing fundamental life-supporting functions such as breathing, heart rate, and blood pressure.

Discriminate Sounds

The ability to distinguish between different sounds, an important aspect of auditory perception.

Cerebellum

The cerebellum is a major feature of the hindbrain of all vertebrates and is primarily responsible for regulating motor movements, including balance, coordination, and speech.