An Investigator Conducts an Experiment Involving the Effects of Three

question 94

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 planned comparisons, using a = .05. The critical value is _________.

• A) ± 2.262
• B) - 1.833
• C) ±2.228
• D) 3.95
• E) 3.20

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Definitions:

Neurotransmitter

Chemical substances that transmit signals across a synapse from one neuron to another in the brain and nervous system.

Anorexia Nervosa

A psychological and life-threatening eating disorder characterized by an extremely low body weight, a severe fear of gaining weight, and a distorted perception of body weight and shape.

Serotonin

A neurotransmitter in the brain that plays key roles in regulating mood, emotion, appetite, and sleep.

Fat Cells

Specialized cells that store energy in the form of fat and regulate metabolism and appetite through hormone release.