In a Honolulu Heart Study, researchers are intered in studying the following question: Do people living in Hawaii live longer than the national average? The mean age of the population is 53 years. The...

In a Honolulu Heart Study, researchers are intered in studying the following question: Do people living in Hawaii live longer than the national average? The mean age of the population is 53 years. The mean age of 101 persons in Hawaii equal 54.85, with a standard deviation of 5.5 years. Use a significance level of 0.05.

What is the observed test statistic?