What Is the Minimum Sample Size Required to Estimate a Population

question 14

Multiple Choice

What is the minimum sample size required to estimate a population mean with 90% confidence when the desired margin of error is D = 1.25? The standard deviation in a preselected sample is 8.5.

• A) n = 76
• B) n = 125
• C) n = 126
• D) n = 190

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Definitions:

Neurotransmitter

Chemical substances in the nervous system that transmit signals from one neuron to another.

Inhibitory

Pertaining to a neurotransmitter, hormone, or other substance that decreases the likelihood of a neuron firing an action potential.

Excitatory

Referring to substances or processes that increase the likelihood of a neuron firing and transmitting an electrical signal.

Dopamine

A neurotransmitter involved in reward, motivation, and addiction processes in the brain.