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.
Yangtze River Floods, China (1931) To top the list of worst natural disasters of all time, you canât just wreak havoc in one fell swoop. Youâve gotta stick around for a while. And the Yangtze River floods did just that, starting with torrential rains in April 1931 and continuing into JULY.