You Want to Estimate the Difference in Grade Point Averages

question 21

Short Answer

You want to estimate the difference in grade point averages between two groups of college students accurate to within 0.20 grade point, with probability equal to 0.95. If the standard deviation of the grade point measurements is approximately equal to 0.5, how many students must be included in each group? (Assume that the groups will be of equal size.)
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Definitions:

Acetylcholine

A neurotransmitter involved in many functions including muscle movement and memory.

Serotonin

A neurotransmitter in the brain that affects mood, emotion, and sleep, playing a key role in preventing depression and regulating anxiety.

Dopamine

A neurotransmitter in the brain that plays a key role in reward, motivation, memory, and attention, and is often associated with the pleasure and reward system.

Therapeutic Half-life

The time required for the concentration of a drug in the body to decrease to half of its starting dose, which is crucial in determining the drug's dosage and scheduling.