Dr. hammond is interested in studying stress in the workplace. he collects data on salaries, number of hours worked, and reported stress level to see if any relationships exist between these variables. what research method is dr. hammond using?

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.

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