A two-tailed test is chosen over a one-tailed test
a. in most studies.
b. when a researcher does not have a good idea of where the sample mean will fall.
c. when the researcher knows a sample mean will fall in one of the tails.
d. when a researcher has a clear idea of the tail in which the sample mean will fall.
Question 2
When neither the subjects nor the experimenter are aware of which group is
experimental and which is control, then the study is said to be
a. contaminated
b. confounded
c. concealed
d. double-blind
A killer whale plays with a ball of ice, soon after a researcher had thrown a snowball at the whale.
Digital rectal exam (DRE). The physician’s index finger is inserted into the rectum and pressed agai
Prehensile-Tailed Porcupine
The Normal Distribution of Scores for a Standardized Intelligence Test
Heel-to-shin test
Allen’s test