A dentist decides to investigate whether a pre-operation briefing (or lack thereof) affects his patients' anxiety scale ratings on a standardized test taken immediately following a root canal operation. He is also interested in knowing whether these ratings are affected when classical, rock, or no music is playing during the operation. How can he simultaneously measure the effects of these two conditions? Choose the appropriate test.
a. Chi-square Test for Goodness of Fit with 1 df
b. Chi-square Test for Goodness of Fit with > 1 df
c. Chi-square Test for Independence
d. z-test for a proportion
e. One-way ANOVA
f. Two-way ANOVA
Ans: f
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