Christina Conducts a Study on the Effects of a Reading

question 37

Multiple Choice

Christina conducts a study on the effects of a reading comprehension course to help first-graders who aren't reading at their grade level. She obtains a sample of 30 children from an inner city elementary school, and 30 children from a school in the suburbs. The 30 inner-city children are the control group and don't get the treatment, and the 30 children from the suburbs are the experimental group and get the treatment. Six months later, the children in the treatment group improved markedly in their reading, whereas the children in the control group did not. Christina's study suffers from which threat to internal validity?

• A) Instrumentation
• B) Selection
• C) Mortality
• D) Diffusion of treatment

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Definitions:

Flood Control System

involves infrastructure and strategic planning aimed at reducing or preventing the damage caused by excessive water levels, including dams, levees, and drainage systems.

Expected Loss

The anticipated amount of loss a party incurs due to risk, calculated as the sum of all possible losses each multiplied by the probability of that loss occurring.

Coastal Town

A town located near or on the coastline, often characterized by maritime activities and tourism.

Flood Control System

An infrastructure or set of strategies intended to manage the potential negative impacts of flooding on communities, including prevention measures and emergency responses.