If a Stratified Random Sample Is to Be Conducted, Which

question 155

Multiple Choice

If a stratified random sample is to be conducted, which of the following is true?

• A) The population will be broken down into subgroups called strata.
• B) Each subgroup should contain items that are homogeneous with respect to the characteristic of interest.
• C) If effective, the total required sample size should be less than that which would be needed if a simple random sample were selected.
• D) All of the above.

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Definitions:

Absolute Refractory Period

The period immediately following the firing of a nerve fiber when it cannot be stimulated to fire again, no matter how strong the incoming signal.

Action Potential

A momentary change in electrical potential on the surface of a neuron that occurs when it is stimulated and is capable of transmitting a signal along the neuron.

Millivolts

A unit of electric potential equal to one thousandth of a volt.

Relative Refractory Period

A phase following immediate action where a neuron is less responsive to stimulation and requires a stronger than normal impulse to activate.