Explain why control of extraneous variables is a necessary component of an experiment
What will be an ideal response?
In an experiment, control of extraneous variables is necessary to avoid the third-variable problem. Specifically, the experiment must rule out the possibility that any variable, other than the independent variable, is responsible for causing changes in the dependent variable.
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a. impaired vision and hearing b. seizures c. autism and schizophrenia d. swollen liver, jaundice, and anemia
______ are charged atoms that have gained or lost one or more electrons.
A. Ions B. Polarizations C. Electrolytes D. Positrons
A sweater looks blue because it has properties that a. reflect short wavelengths while absorbing longer wavelengths
b. reflect long wavelengths while absorbing shorter wavelengths. c. refract short wavelengths while absorbing longer wavelengths. d. refract long wavelengths while absorbing shorter wavelengths.
In which of the following situations are you NOT able to hear the nearby frantic scream of a scared child?
a. during a skydive c. in outer space b. while swimming underwater d. standing ten feet away