A professor randomly selects four groups of 25 students from her statistics classes. She gives each of them a very difficult quiz consisting of 50 questions. Two groups are told that there is a 15 minute time limit and the other two groups are told they have as much time as they need. In addition, she tells one of the "time limit" groups and one of the "no time limit" groups that these questions are very much below their level of expertise. The remaining two groups are not told this. She wishes to test for the effect of time constraints and the anticipation of difficulty on their post-exam anxiety ratings measured by a standardized anxiety test. How should she test this?
a. One-way ANOVA
b. Two-way ANOVA
c. Chi-square Test for Goodness of Fit
d. Chi-square Test for Independence
e. t-test for dependent means
Ans: b
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