Test Hypotheses About a Population Proportion
-According to a National $2000,3.7 \%$

Test Hypotheses about a Population Proportion
-According to a national statistics bureau, in $2000,3.7 \%$ of males living in the Southwest were retired exterminators. A researcher believes that the percentage has increased since then. She randomly selects 250 males in the Southwest and finds that 4 of them are retired exterminators. Test this researcher's claim at the $\alpha = 0.1$ level of significance.