A researcher is interested in the influence of temperature on helping behavior. To investigate this topic the researcher prepares a waiting room in which the temperature can be accurately controlled. In the adjoining room he prepares an audio recording of a subject acting out an epileptic seizure. A subject is seated in the room with the temperature set at one of three levels (hot/comfortable/cold). After the subject has waited in the room for 15 minutes the recording is played and the experimenter records if the subject attempted to provide assistance (yes/no).

Which statistical procedure would you apply to determine whether there is a significant difference between temperature levels with respect to helping behavior?

		Chi-square
		t-test
		ANOVA
		Median test