DrPrutherow Believes That People Who Are Under Stress Will Develop

question 227

Multiple Choice

Dr.Prutherow believes that people who are under stress will develop more colds than people who are not under stress.When he randomly selects 10 participants and exposes them to high levels of stress,he finds that 9 of the participants develop colds.Based on these results he concludes that stress causes an increase in colds.Dr.Prutherow's reasoning may be flawed because in this study

• A) there was no dependent variable in his study.
• B) there was no control group for comparison.
• C) he didn't formulate a hypothesis before he collected his data.
• D) he didn't measure the independent variable when the study ended.

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Definitions:

Current

The rate of flow of electrons.

Coil

A component that produces a magnetic field when electric current flows through it.

Inductance

The property of an electrical conductor by which a change in current flowing through it induces an electromotive force in both that conductor and any nearby conductors.

Parallel

A type of electrical circuit connection wherein components are connected across the same voltage, leading each path to carry a part of the total current.