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.
Hurricane Katrina was the costliest natural disaster in U.S. history, causing around $108 billion (2005 USD) in damage. Katrina was the eleventh named storm of the 2005 Atlantic hurricane season, fifth hurricane, third major hurricane, and the second Category 5 hurricane of the season.