When the Change from Pretest to Posttest Is Due Not

question 22

Short Answer

When the change from pretest to posttest is due not to your program but rather to a change in the way you measured the outcome,there is a(n)_______________ threat to internal validity.

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Definitions:

Sigmoidoscopy

A medical examination in which a long, flexible tube with a camera (sigmoidoscope) is inserted into the rectum to examine the sigmoid colon.

Flexible Fiber-Optic

Refers to a type of technology that uses thin, flexible fibers of glass or other transparent solids to transmit light, allowing for the viewing or delivery of light in tight or curved spaces.

Pupils

The black circular openings in the center of the iris of the eye, which regulate the amount of light that enters the eye.

Accommodation

The process of the lens changing shape to permit close vision.