#9 Please refer to the following pic and help.

course: statistic

An experiment was conducted to determine whether there is a difference between washing hands with antiseptic soap and ruhbing hands with alcohol based solution. Hand bacteria counts were measured in colony forming units {chi} with the results summaried below. Use a 0.05 si ' 'cance level to test the claim that washing with soap results in a higher mean of bacteria count than ruhhing hands with alcohol based solution. Assume that the two samples are independent simple random samples selected from normally distributed populations. Ilo not assume that the population standard deviations are equal