2. E. canis infection is a tick-borne disease of dogs that is sometimes contracted by humans. Among infected humans the distribution of white blood cell counts has an unknown mean µ and a standard...

Extracted text: 2. E. canis infection is a tick-borne disease of dogs that is sometimes contracted by humans. Among infected humans the distribution of white blood cell counts has an unknown mean µ and a standard deviation o. In the general population, the mean white cell blood count is 7250/mm. It is believed that persons infected with E. canis must on average have lower white cell blood counts. (a) What are the null and alternative hypotheses for a one-sided test? (b) For a sample of 15 infected persons, the mean white blood cell count is x the standard deviation is s = 3191/mm'. Conduct the test at the a = 0.05 level. 4723/mm and (c) What do you conclude?