In testing for differences between the means of two independent populations, the null hypothesis is:

Articles of the confederation is a good representation of a system of government.

Why is it economically necessary for the east germans to build berlin wall

Atraffic cop has pulled over a speeder, only to discover that he has stopped a close friend. the police officer is torn, because his professional obligations demand that he punish the speeder, but his personal obligations suggest that he should give a friend a break. what is this called?