Professor Bulwark Conducted a Study of the Effects of Reading

Multiple Choice

Professor Bulwark conducted a study of the effects of reading level on comprehension, but found no significant differences between the experimental and the control group. She changed her manipulation and ran the study again, but still found no significant differences. After once again making changes to her manipulation, the third study produced the expected results. She reports only results from Study Three. Professor Bulwark

A) increased her chances of committing a Type II error.
B) engaged in methodological tuning.
C) followed accepted ethical practices.
D) all of the above