Exam 3: Research Methods

Doubt or skepticism has no place in science.

A ______ controls for both known and unknown confounding variables by ensuring that groups are equal before the experiment begins.

Drew is running a study on the effects of alcohol on memory recall. He has two groups: one that receives alcohol and one that receives water. He checks in on the progress of the alcohol group more frequently and may have given that group more instructions. The MOST obvious weakness of Drew's study is ______.

______ is the study of the genetic and environmental contributions to an organism's behavior.

In an experiment, the independent variable is

Untended variables that operate in conjunction with the independent variable making the experimental effect harder to find are referred to as ______ variables.

In an experimental test of the effects of Vitamin B-12 on problem-solving performance, ______ is the independent variable, and ______ is the dependent variable.

In an experiment, the ______ variable is deliberately manipulated by the researcher.

Helena proposes that the more impulsive a student is, the more likely he or she will be to change answers on a multiple-choice test. This statement is an example of a(n) ______.

In a longitudinal design,

In an industrial psychology experiment, one group of participants is exposed to confinement while another group is not. All participants then perform a manual dexterity task, and their performance is examined. What is the independent variable?

In ______ sampling, each member of the population is equally likely to be included in the sample.

What is a hypothesis? Provide an original example of a hypothesis a psychologist might test. Be sure to operationally define the variables in your hypothesis.

A(n) ______ entails examining families across multiple generations to find the association between particular DNA marker alleles and particular traits.

Reba and Reni are twins. They developed from a single fertilized egg dividing shortly after conception. Reba and Reni are ______ twins, more colloquially called ______ twins.

In reality, the case study is very rarely used to study individual participants.

A pharmaceutical company wishes to test the efficacy of a new antidepressant with a double-blind procedure. Which answer correctly describes the procedure the company would use?

Between which pair of values is one MOST likely to find a positive correlation?

Participant selection and assignment is vital to experimental design. Define random selection, and explain how it increases the external validity of the research design. Distinguish between a randomized control trial and a match subjects design; explain how both designs increase a study's internal validity.

According to the textbook, ______ variables change along with the independent variable, making it difficult to pinpoint actual causes.