The British Medical Journal (August 17, 2002) published a study to compare the effectiveness of handwashing with soap and hand rubbing with alcohol. Health care workers who used hand rubbing had a mean bacterial count of 35 per hand with a standard deviation of 59. Health care workers who used handwashing had a mean bacterial count of 69 per hand with a standard 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 Y̅ is less than 30. Give your opinion on whether this sample of workers used hand rubbing with alcohol or handwashing with soap.