1/ 16% of all Americans suffer from sleep apnea. A researcher suspects that a lower percentage of those who live in the inner city have sleep apnea.

Of the 332 people from the inner city surveyed, 27 of them suffered from sleep apnea. Test the claim at the level of significance of

= 0.05?

1. What type of test should be run?

• t-test of a mean
• z-test of a proportion

1. The alternative hypothesis indicates a

• one-tailed test
• two-tailed test