## Understanding Experiment Designs

1. What might account for random error in an experimental measure?

• natural variation among and within subjects
• A systematic flaw in the logging software
• A pattern of dropped data for every fifth subject
• Biased observations
2. Which of the following would be an ordinal response? (Mark all tha apply)

• Responses on a Likert-type scale
• Height in centimeters of each subject
• Favorite color of each subject
• How spicy each subject prefers their Thai food using 1-5 stars

• The number of heads resulting from one-hundred coin flips
3. In an experiment, factors are the independent variables manipulated by the experimenter, and level are the specific values a factor can take on.

• True
• False
4. A between-subjects factor is most precisely defined by which of the following characteristic?

• Each subject experiences more than one level of the factor
• Each subject experiences only one level of the factor,
• Each subject experiences all levels of the factor.
• Each subject experiences all but one level of the factor.
• None of the above
5. A within-subjects factor is most precisely defined by which of the following characteristic?

• Each subject experiences more than one level of the factor.
• Each subject experiences only one level of the factor,
• Each subject experiences all levels of the factor.
• Each subject experiences all but one level of the factor.
• None of the above
6. If a given factor has four levels and subjects experience two of the four levels, that factor is most precisely described as:

• A within-subjects factor
• A between-subjects factor
• A partial within-subjects factor
• A partial between-subjects factor
• None of the above
7. Balanced experimental designs are where every subject experiences every level of every factor

• True
• False
8. The most common use of an independent-samples t-test is to examine which of the following?

• One set of subjects that all does the same thing
• One set of subjects that does two different things
• Two sets of subjects that do the exact same thing
• Two sets of subjects that do different things
• None of the above
9. Which of the following is the most proper way to report a t-test result?

• t(14) = 2.76. p = .015
• t(14) = 2.76, p < .05
10. A t-test is a test suited to one factor with two levels

• True
• False