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Discussion 1.
In an experiment, one group of research participants is given 10 pages of material to proofread for errors. Another group proofreads the same material on a computer screen. The dependent variable is the number of errors detected in a 5-minute period. A .05 significance (alpha) level is used to evaluate the results.
a. What statistical test would you use?
b. What is the null hypothesis? The research hypothesis?
c. What is the Type I error? The Type II error?
d. What is the probability of making a Type I error?
Discussion 2. Read the following scenario and explain what power issues may arise.
What factors influence statistical power? A researcher is exploring differences between men and women on 'number of different recreational drugs used.' The researcher collects data on a sample of 50 men and 50 women between the ages of 18-25.
Each participant is asked 'how many different recreational drugs have you tried in your life?' The IV is gender (male/female) and the DV is 'number of reported drugs.'
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