Assignment: Null results
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Assignment: Discuss One reason a valid experiment may produce null results is
Complete the following quiz. Choose your response by highlighting your answer.
1. When we perform an experiment, we
a. measure independent variables,
b. produce dependent variables.
c. produce control variables.
d. produce a comparison.
e. hold independent variables constant.
2. The control group in an experiment
a. fixes the level of a variable across all experimental conditions.
b. is often untreated.
c. receives the same level of the independent variable as the experimental group.
d. refers to the manipulation of the independent variable.
3. In research on the decompression of pregnant rats, the independent variable is ______, a dependent variable is ________, and a control variable is _______________.
a. Reduced air pressure; behavioral tests; strain of the rat
b. Body weight; climbing ability; time of day
c. Atmospheric pressure; age of rat; climbing ability
d. Number of decompressions; body weight; home cage
e. Experimental group; control group; test performance
4. In experiments, independent variables are
a. the result of careful measurements.
b. extraneous to the experiment and held constant.
c. extraneous to the experiment and allowed to vary randomly.
d. independent of experimenter control.
e. varied by the researcher.
5. Dependent variables are
a. manipulated by the researcher.
b. potential independent variables that are held constant.
c. measured by the researcher.
d. probable behavioral causes.
6. One reason a valid experiment may produce null results is
a. the range of levels in the independent variable was insufficient to show an effect.
b. the dependent variable reflects a broad range of performance.
c. that the experiment is conducted in an environment that is too difficult.
d. that reactivity occurs in the participants (e.g., they adopt the role of “good behavior”).
7. In experiments, the independent variable should be _________, the dependent variable should be __________, and the control variable should be ________.
a. controlled; constant; randomized
b. constant; an effect; causal
c. free; restricted; elevated
d. balanced; unconfounded; an effect
e. manipulated; measured; held constant
8. An interaction occurs when
a. an independent variable effects a dependent variable.
b. one independent variable effects a second independent variable.
c. the effect one dependent variable has is not the same at each level of a second dependent variable.
d. the effect one independent variable has is not the same at each level of a second independent variable.
9. Which of the following is an example of the Hawthorne effect?
a. Experimenter bias
b. Reactivity in an experiment
c. Participant observation
d. Unobtrusive outcomes
10. A variable that inadvertently causes an experimental result is
a. confounded with the dependent variable.
b. confounded with the independent variable.
c. confounded with the control variables.
d. unlikely to be important in experiments.
11. Construct validity permits one to do which of the following?
a. Generalize
b. Attribute causality
c. Have confidence in constructs
d. Support hypothesis
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