A researcher designed an experiment to determine if consumption of caffeine results in increased level of motor activity. The study was done at 7 AM each day. A confounding variable could be
a. time of day.
b. caffeine.
c. level of motor activity.
d. experimental design.
a
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______ refers to sample standard deviation divided by the square root of the sample size.
A. Standard deviation error B. Estimated standard error C. Sampling standard error D. Estimated sampling error
What is the best way to determine if an individual who claims to never dream does, in fact, have dreams?
a. Ask them about their dreams immediately after they wake up in the morning. b. Wake them up during REM sleep and ask them if they have been dreaming. c. Wake them up during NREM sleep and ask them if they have been dreaming. d. Ask them under hypnosis if they have had any dreams recently.
It's often said that "life doesn't exist in a vacuum." However, the emptiness of ________ is critical for brain functioning.
A. nerves B. receptors C. dendrites D. synapses
For adverse impact to have practical significance, the minority selection ratio must be less than ____ percent of the majority selection ratio
a. 50 b. 30 c. 80 d. 75