A medical journal published the results of a study to compare the effectiveness of handwashing with soup and handrubbing with alcohol. Health care workers who used handrubbing had a mean bacterial count of 36 per hand with a standard deviation of 64. Health care workers who used handwashing had a mean bacterial count of 71 per hand with a standard deviation of 109. In a random sample of 50 health care workers,
all using the same method of cleaning their hands, the mean bacterial count per hand, x, is greater than 80. Give your opinion on whether this sample of workers used handrubbing with alcohol or handwashing with
soap
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Since the probability of being greater than 80 is
likely that this sample of workers used
if this sample of workers used handrubbing with alcohol, and
if they used handwashing with soap, it is more