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 percent level of significance, conduct an appropriate hypothesis test.
- 2011 subscript: 2011 group.
- 2010 subscript: 2010 group
Two computer users were discussing tablet computers. A higher proportion of people ages 16 to 29 use tablets than of people age 30 and older. the table details the number of tablet owners for each age group. Test at the 1 percent level of significance.
| 16–29 year olds | 30 years and older | |
| Own a Tablet | 69 | 231 |
| Sample Size | 628 | 2,309 |
OpenStax Statistics, 10.3 Comparing Two Independent Population Proportions, exercise 38