A researcher is studying the effect upon pain of providing hypnosis with dental work
The researcher's three groups are (1) hypnosis before and during the procedure, (2) hypnosis before but not during the procedure, and (3) no hypnosis. If the researcher plans to use an ANOVA for the statistical analysis, which would be an acceptable way to measure pain, for this study? (Select all that apply.)
a. Present versus absent
b. Worse ... Some ... A Lot ... Unbearable
c. 0- to 100-point verbal numerical scale
d. Systolic blood pressure readings
e. The force with which the subject squeezes a rubber ball with pressure gauge attached
ANS: C, D, E
The parametric statistics used to determine differences that are covered in this chapter are the independent samples t-test, paired or dependent samples t-test, and analysis of variance (ANOVA). ANOVA requires that the dependent variable be at the interval or ratio level: a verbal numerical scale, systolic blood pressure readings, and force with which the subject squeezes a rubber ball are all interval or ratio level variables.
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