Exam 8: Experimental Design

If you cannot use all possible orders in a repeated measures design,a good alternative is to use

A design that has two conditions with the same participants in each condition is a(n)________ design.

When a confound is discovered in an experiment,

The two kinds of order effects that are associated with the passage of time are

Which one of the following accurately describes a disadvantage of specifically using a pretest-posttest design?

An experiment has internal validity when

Which of the following statements is incorrect? In an experimental design,mortality can refer to the

A researcher wants to know whether wearing sunglasses improves driving performance.In a counterbalanced repeated measures design,presence or absence of sunglasses would be varied by

Gabriel measures participants on a variable of interest and rank orders them according to their scores.He then places them in pairs in which each member has approximately the same score as the other member in the pair.The members of each pair are then randomly assigned to the conditions in the experiment.Gabriel's method of participant assignment is an example of a _____ design.

One problem with the pretest-posttest design is that

Participants solve several anagram puzzles over the course of 30 minutes.Even though the puzzles were known to be of equal difficulty,participants solved the puzzles in less and less time as the 30-minute period progressed.This is likely the result of a _____ effect.

Failure of the experimenter to control some extraneous variable may result in a(n)

At the end of a three-year study,Susan finds that 12 percent of her participants did not take part in the final survey because they moved away.In research terms,Susan is experiencing a _____ problem.

A matched pairs design is used when

A researcher wants to know whether wearing sunglasses improves driving performance.If an independent groups design is used,the researcher would manipulate the variable by

Jeff woke up with a headache.He took two orange-flavoured aspirins.When he still had the headache an hour later,he then took two cherry-flavoured aspirins and his headache was gone in 45 minutes.What factor might have been theoretically responsible for alleviating Jeff's headache?

Which one of the following accurately describes an advantage of using a pretest-posttest design over using a posttest-only design? With a pretest-posttest design,one can

A psychologist is interested to know which of two sorting techniques leads to better memory performance in 6-year-olds.Each participant first sorts a set of pictures any way he or she would like.Recall is then tested.After this,each participant is required to sort an equivalent set of pictures into five predetermined categories.Recall for the items in this test is then tested.What procedure does this study represent?