APUSH

Significance of start date: 1844
Signifigance of end date: 1877

After a heavy rainstorm vegetation on a hillslope was completely removed. how will this removal of vegetation affect the relative amounts of infilitration and runoff that occur during the next heavy rainstorm.

Many schools have a dietician on staff.

The difference of sample means of two populations is 55.4, and the standard deviation of the difference of sample means is 28.1. which statement is true if we are testing the null hypothesis at the 95% confidence level? a. the difference of the two means is significant, so the null hypothesis must be rejected. b. the difference of the two means is significant, so the null hypothesis must be accepted. c. the difference of the two means is not significant, so the null hypothesis must be rejected. d. the difference of the two means is not significant, so the null hypothesis must be accepted.