Activities 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