Though the northernmost islands experience a bit of rain, September is largely dry, warm and sunny throughout the islands. High season in Hawaii doesn't start till mid-December, so September is still off-season for the Hawaii tourism industry and deals abound.
T-tests and analysis of variance (ANOVA) are widely used statistical methods to compare group means. For example, the independent sample t-test enables you to compare annual personal income between rural and urban areas and examine the difference in the grade point average (GPA) between male and female students.
An ANOVA can be more useful than a two-sample t-test as it has a lesser chance of committing a type I error. For instance, having multiple two-sample t-tests would have a greater chance of committing an error than an ANOVA of the same variables involved to get the mean.