Why is it important for researchers to use a control group in a scientific study? only when participants listen carefully and follow precisely the instructions of the experimenter will the study be controlled and thus yield valid scientific conclusions. when a researcher manipulates the control group, it is always under carefully scrutinized and supervised conditions, thereby increasing the validity of the study. it is important to show that between two groups that were similar from the beginning of the study, the one that received the manipulation is the one that changes. the control group receives the experimental manipulation or intervention and is therefore the reason one would conduct a scientific study in the first place?

Which of the following is an example of the treatment technique for ocd called exposure and response prevention (erp)? a. callie has a hoarding compulsion. she becomes anxious whenever she has to throw something away; she even keeps stuff that she doesn't need and will never use. her therapist has arranged for callie's unnecessary belongings to be discarded of when she is away from home. b. carrie has an obsessive fear of contamination which has led to compulsive hand washing. her therapist is treating her by making her touch dirty laundry but not allowing her to wash her hands following for increasingly longer periods of time. c. kelly has religious obsessions. she feels that if she doesn't read biblical passages every hour of the day, she will do something evil. her therapist is treating her by having her attend religious services more frequently so that good thoughts will replace the bad ones. d. kerry has an obsessive fear of contamination which has led to compulsive hand washing rituals. her therapist is treating her by forcing her to wash her hands repeatedly, even when she doesn't feel anxious.