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 10 outstanding List. Top 10 Natural Disasters in Japanese History. Japan is certainly one of those countries most affected by natural disasters and calamities. Some of the most expensive natural disasters have occurred in Japan, costing more than $181 billion for reforms and rebuilding, in the years 1995 and 2011. Japan has also been the site of ten of the worst natural disasters that have occurred during our own times in the 21 st century.