Fruit flies are used frequently in genetic research because of their quick reproductive cycle. The length of the thorax (in millimeters) was measured for each fly in a random sample of 49 male fruit flies. The mean length was x̅ = 0.8004 mm , with a standard deviation of s_x = 0.0782 mm. Construct and interpret a 90% confidence interval for the true mean thorax length of a male fruit fly.