Which of the following is the most dependent on sample size?

Howard has decided to seek treatment for alcoholism. His therapist and he decide on a treatment called covert sensitization. What can Howard expect from this treatment?

a) He will be isolated so he is away from negative influences. b) He will be asked to imagine the negative consequences of drinking. c) The therapist will teach him how to monitor his blood alcohol concentration as discreetly as possible. d) He will join a cult dedicated to treating serious disorders by engaging in an altered state of consciousness.

In correlational research, the investigator:

a. Systematically observes two variables to see whether there is an association between them b. Manipulates a variable under carefully controlled conditions and observes whether there are changes in a second variable as a result c. Exposes subjects to two closely related treatment conditions d. Simultaneously manipulates two or more independent variables