When Events That Occur During the Course of a Study

question 25

Multiple Choice

When events that occur during the course of a study have a different effect on one group of participants than on another,the possible threat to internal validity is

• A)history.
• B)selection.
• C)differential regression.
• D)additive effects of selection and history.

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Definitions:

Cell Walls

Rigid or semi-rigid structures surrounding the cell membrane of plants, fungi, and bacteria, providing shape, protection, and support.

Chemical Composition

The identification and proportion of the elements or compounds that constitute a substance or material.

Diplococci

A type of bacteria that forms pairs and is often associated with infections such as pneumonia.

Gonorrhea

A sexually transmitted infection caused by the bacterium Neisseria gonorrhoeae, known for affecting mucous membranes.