Experimental Design Answers

Placebos are sometimes used in research in order to demonstrate the effects of participant expectations or beliefs on the outcome of behavior.

One of the purposes of an experiment is to determine whether the dependent variable affects the independent variable.

A confounding variable can also be considered an extraneous variable.

All of the following are types of sampling techniques used in research except __________ sampling. A.quota B.availability C.convenience D.random

A study done on the driving habits of motorists in 1925 will be generalizable to present-day motorists.

Both the experimental group and the control group are exposed to the same __________. A. type of treatment B. independent variable C. confounding variables D. placebo treatment Please select the best answer from the choices provided

Read the experimental design below and answer the question that follows.A researcher wants to determine the effects of sleep on memory and decides to schedule two groups of subjects for a sleep study. Both groups will be asked to memorize as many items as they can from the same prepared list of items. Then they will be allowed to go to sleep. In group A, the subjects will only be allowed to sleep for six hours. In group B, the subjects will be allowed to sleep for their usual amount of time. After each subject is finished sleeping, a quiz will be given over the list that was supposed to be memorized.What is the independent variable in the experiment?A.amount of sleepB.group B subjectsC.memoryD.group A subjects

Which is the fairest way to take a representative sample from a population? A. choosing participants who will ensure that study results will support the hypothesis B. carefully selecting specific subjects who meet one’s criteria from the population C. ensuring that every subject in the population has an equal chance to be selected D. using a survey to screen out participants who may interfere with other subjects Please select the best answer from the choices provided

Convenience sampling can produce biased research results.

In an experiment, researchers want to determine if the __________ variable causes changes in the __________ variable.A.dependent . . . independent B.confounding . . . independent C.independent . . . dependent D.dependent . . . extraneous