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Answer: alternative D.
Explanation: Dr. DeVries should choose his sample population randomly in order for his research to be representative, even having a specific population, which is high school seniors, that he wants to study. By <u>choosing specifically students from an exclusive college preparatory school, he isn't considering how students from other schools might perform in his research test</u>. This would be a very important step for him to understand how the practice in problem solving affects the ability related to it. Otherwise, he will have a distorted result.
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Answer:
With its population of traders, merchants and scholars, Timbuktu was known throughout western Africa and its fame extended to Europe and Asia. Timbuktu is best known for its famous Djinguereber Mosque and prestigious Sankore University, both of which were established in the early 1300s under the reign of the Mali Empire, most famous ruler, Mansa Musa.
Explanation:
