Chapter 10, Problem 104H

Use the following information to answer the next three exercises. Neuroinvasive West Nile virus is a severe disease that affects a person’s nervous system . It is spread by the Culex species of mosquito. In the United States in 2010 there were 629 reported cases of neuroinvasive West Nile virus out of a total of 1,021 reported cases and there were 486 neuroinvasive reported cases out of a total of 712 cases reported in 2011. Is the 2011 proportion of neuroinvasive West Nile virus cases more than the 2010 proportion of neuroinvasive West Nile virus cases? Using a 1% level of significance, conduct an appropriate hypothesis test.

• “2011” subscript: 2011 group.

• “2010” subscript: 2010 group\

An appropriate null hypothesis is:

a. $p_{2011}\le p_{2010}$

b. $p_{2011}\ge p_{2010}$

c. $\mu p_{2011}\le \mu p_{2010}$

d. $p_{2011}>p_{2010}$