The Institute of Education Sciences measures the high school dropout rate as the percentage of 21-through 29-year-olds who are not enrolled in school and have not earned a high school credential. Last year, the high school dropout rate was 7.1%. A polling company recently took a survey of 3,000 people between the ages of 21 and 29 and found that 5.5% of them are high school dropouts. The polling company would like to determine whether the dropout rate has decreased. Calculate the value of the test statistic.