- The difference between a research question and a research hypotheses is that a hypotheses make a prediction about what will happen and a question does not make a prediction.
- You want a representative sample of all the people insured by a large insurance company. How would probability sampling achieve a representative sample of this population?
Probability sampling would survey everyone.
Probability sampling would survey every person at one of the organizations insured by the company.
Probability sampling would survey a convenience sample of people employed by the company.
Probability sampling would survey a random sample of everyone insured by the company.
- Which statement best describes external validity?
External validity deals with whether the results from a study generalize.
External validity deals with whether the measures used in a study are appropriate.
- Ethnographic research is an example of qualitative research
- In some studies, the independent variable can be considered as the cause and the dependent variable as the effect.
- Which of the following procedures would control extraneous variables?
Hold the variables constant across all comparison groups.
Use a large convenience sample.
- Controlling extraneous variables in a study is necessary because those variables may prevent the researcher from drawing correct cause and effect conclusions.
- A non-normal rating scale (such as a Likert-type scale) is a ratio measure.
- Which of the following techniques is the best way to test for validity?
Assess the inter-rater agreement
Perform a test-retest analysis
Check the inter-item consistency
Correlate the measure with other measures of the same construct
- Which of the following two techniques is a test of reliability?
Assess the inter-rater agreement
Test if an instrument predict future performance
- Which of the two designs would best protect against threats to internal validity?
Soloman Four-Group Design
One Shot Case Study Design
- Which of the following research approaches is both repeatable and allows for causal inferences
- To demonstrate predictive validity of a job selection test, you want to show that there is NO correlation between the test and the future job performance of the employees.
- Construct validity of a performance ratings can be demonstrated when
There is no correlation between the ratings and other indicators of performance
There are only positive correlations between the ratings and other indicators of performance
There are only negative correlations between the ratings and other indicators of performance
There are both positive and negative correlations between the ratings and other indicators of performance
- The distribution of scores on a final exam shows that most of the students scored very high, but there are quite a few with pretty low scores. A frequency distribution will probably show that the data are
- Which of the following will increase the power of a statistical test?
Increase you sample size
Decrease your sample size
- When comparing two groups, the hypothesis that there is no difference between the groups is called the ____________ hypothesis.
- A correlation (Pearson r) between a standardized test and Freshman grades is r = .80. This r shows a ___________ relationship between the two variables.
- In a study to test the relationship between class size and learning effectiveness, which statistical test would be most appropriate?
- As part of an investigation of online learning, the researcher measures student satisfaction with chat rooms compared to discussion boards. The comparison between the chat rooms and discussion boards should be tested using which statistic?