Random selection and random assignment are the same thing. Question options: Fal

Question

Random selection and random assignment are the same thing.

Question options:

False

The variable sex (male vs. female) is measured at the nominal level.

Question options:

True

False

What are the two defining features of an experiment?

Question options:

control of extraneous variables; statistical analysis of the results

statistical analysis of the results; a comparison of two groups

a comparison of two groups; manipulation of an independent variable

manipulation of an independent variable; control of extraneous variables

False

The variable sex (male vs. female) is measured at the nominal level.

Question options:

True

False

What are the two defining features of an experiment?

Question options:

control of extraneous variables; statistical analysis of the results

statistical analysis of the results; a comparison of two groups

a comparison of two groups; manipulation of an independent variable

manipulation of an independent variable; control of extraneous variables

Explanation / Answer

Random selection and Random assignment are two completely different processes. Random selection is used to select a random sample from a population which is the true representation of the population. Random assignment on the other hand is randomly assigning the sample to two different groups, the experimental group and the control group. The sample is first "selected" from the population and then "assigned" to the two groups which have been established for research purposes.

Thus, the correct answer is B, False.

The two defining features of an experiment are manipulation of an independent variable and control of extraneous variables. An experimenter in a research project studies the cause and effect relationship between the independent variable and the dependent variable. The independent variable is manipulated in order to see it's effect on the dependent variable while controlling the extraneous variables which could affect the experiment. For instance, the experimenter wants to see the effect of types of learning (independent variable) on students (dependent variable), he assigns the sample to two different groups. However, in order to correctly carry out the experiment, the extraneous variables like noise, lighting and etcetera must be controlled.

Thus, the correct answer is D.

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