A skin patch contains a new drug to help people quit smoking. A group of 75 cigarette smokers have volunteered as subjects to test the new skin patch. For one month. 40 of the volunteers receive skin patches with the new drug. The other volunteers receive skin patches with no drugs. At the end of two months, each subject is surveyed regarding his or her current smoking habits. Match the information from the study with the type. explanatory variable '/ [choose] 75 cigarette smokers 40 volunteers who got the patch response variable Smoking Habits Skin patches with no drugs placebo Type of Skin Patch Participants did not know which skin patch they received. blind [Choose] V sample [Choose] V