On a Reading Comprehension Exam,the Proportion of Examinees in the Top

question 11

Multiple Choice

On a reading comprehension exam,the proportion of examinees in the top group that answered item 5 correctly equaled 0.70 and the proportion of examinees in the bottom group that answered item 5 correctly equaled 0.10.What is the discrimination index for item 5?

• A)0.36
• B)0.49
• C)0.60
• D)0.80

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Definitions:

UV Light

Ultraviolet light, a type of electromagnetic radiation that is not visible to the human eye, known for its ability to kill bacteria and cause skin damage.

Phospholipids

A class of lipids that form the main structural component of cell membranes, made up of two fatty acids, a glycerol unit, and a phosphate group.

Lipid Bilayer

Double layer of phospholipids arranged tail-to-tail; structural foundation of all cell membranes.

Hydrophobic Tails

The nonpolar, water-repelling part of a phospholipid molecule that faces inward, away from water, in the bilayer of cell membranes.