The British Medical Jou (Aug. 17, 2002) published the results of a study to comp the effectiveness of hand washing with soap and handrubh with alcohol. Health care workers who used handrubb had a mean bacterial count of 35 per hand with a stand deviation of 59. Health care workers who used handwash had a mean bacterial count of 69 per hand with a stand deviation of 106. In a random sample of 50 health care workers, all using the same method of cleaning their hands, the mean bacterial count per hand, , is less than 30. Give your opinion on whether this sample of workers used handrubbing with alcohol or hand washing with soap.