After Doing a Large-Scale Cross-Sectional Study, a Researcher Finds That

question 47

Multiple Choice

After doing a large-scale cross-sectional study, a researcher finds that each successively older group does slightly less well on a test of memory for 10-digit telephone numbers. Which of the following is the best interpretation of this result?

• A) A basic biological change underlies the observed steady reduction of memory skill.
• B) The differences can be explained by gender of the participants.
• C) The difference has nothing to do with practice of memory skills.
• D) No interpretation can be made using this result.

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Definitions:

Nissl Bodies

Structures within the cytoplasm of neurons that are associated with ribonucleic acid (RNA) and protein synthesis.

Rough Endoplasmic Reticulum

A network of tubular membranes within the cytoplasm of the cell studded with ribosomes involved in the synthesis of proteins.

Enteric Nervous System

Known as the "second brain," this extensive mesh-like system of neurons controls the function of the gastrointestinal system.

Digestive Tract

The series of hollow organs joined in a long, twisting tube from the mouth to the anus, where digestion of food occurs.