Description. Performs a t-test for the comparison of the means of two independent samples. This test is not performed on data in the spreadsheet, but on statistics you enter in a dialog box.escription. Performs a t-test for the comparison of the means of two independent samples. This test is not performed on data in the spreadsheet, but on statistics you enter in a dialog box.
The states with the most weather-related disasters topping more than $1 billion are Texas, Missouri, Alabama, Georgia, Tennessee and South Carolina, which each had at least 31 expensive events in the past 30 years.
The effects of Hurricane Katrina, in August 2005, were catastrophic and widespread. It was one of the deadliest natural disasters in U.S. history, leaving at least 1,245 people dead, and a further 135 missing. The storm was large and had an effect on several different areas of North America.