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 Northridge earthquake was the costliest natural disaster to have occurred in the United States at the time, and is today the third largest economic loss caused by a natural disaster in the nationâs history. The damage cost estimate reached $20 billion in damages, and $49 billion in economic loss.