In Constructing a Confidence Interval Estimate for the Difference Between

question 115

Multiple Choice

In constructing a confidence interval estimate for the difference between the means of two normally distributed populations, using two independent samples, we:

• A) pool the sample variances when the unknown population variances are equal
• B) pool the sample variances when the population variances are known and equal
• C) pool the sample variances when the population means are equal
• D) pool the sample variances when the unknown population variances are unequal
• E) never pool the sample variances

---

Definitions:

GABA

Gamma-Aminobutyric Acid, a neurotransmitter in the brain that inhibits or reduces activity of neurons.

Serotonin

A neurotransmitter involved in the regulation of mood, appetite, and sleep, and has some cognitive functions, including memory and learning.

Sleep Needs

The amount of sleep required by an individual to function optimally, which varies by age and individual differences.

Person to Person

Refers to direct interaction or communication between individuals without the intervention of others.