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.
Top Deadliest U.S. Natural Disasters. The Worst Storms & Environmental Disasters in U.S. History. History & Culture. Environmental and natural disasters have claimed the lives of thousands of people in the United States, wiped out entire cities and towns, and destroyed precious historical and genealogical documents.