If an experiment has _____, the researcher is confident that the cause-effect conclusions reached are accurate
a. external validity c. statistical inference
b. statistical frequency d. internal validity
D
Internal validity makes researchers confident in the accuracy of their conclusions.
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Which of the following will not increase the width of a confidence interval?
a. Increase the percentage of confidence from 80% to 90% b. Reduce the sample size from n = 25 to n = 16 c. Increase the sample mean from MD = 2 to MD = 4 d. All of the other options will increase the width of a confidence interval.
A refutable hypothesis must ____
a. refer to variables that can be observed or measured b. make a positive statement about the existence of an effect or a relationship c. allow for the possibility that the observations will not support the hypothesis d. state at least one conclusion that has already been proven
The phenomenon in which an individual is told to perform some act while in a hypnotic trance and then actually performs the act after being roused from the trance is:
a. posthypnotic suggestion b. artificial somnambulism c. the contagion effect d. posthypnotic amnesia
To use a random number table properly one must begin on the top left hand column and read across
Indicate whether the statement is true or false