To test this hypothesis I would select an even number of children (20 children, for example) and divide them into two groups. Each group would undergo a series of medical examinations to assess everyone's health (it is important that all children have a healthy body). Then each group would receive a "mission", the mission of group A would be to go to school only by bus for 6 months, the mission of group B would be to go to school just walking for their months. After this period of time, the children would be submitted to the same exams so that we could assess changes in the health of each one of them.
One of the most important principles of scientific research refers to the establishment of an experiment so that it is possible to collect data that can confirm or cancel a hypothesis. As we can see in the example above, this principle was applied, since a 6-month experiment was established, which will provide data, so that it is possible to confirm or deny the hypothesis that children who walk to school are healthier than those who go to school by bus.
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A long and brutal history of racist policies has kept African Americans from experiencing economic mobility through both legal and extralegal means. While the post-Reconstruction era and Jim Crow policies led to harsh outcomes for African Americans, the response by Southern—and national—politicians to the Civil Rights movement in the 1960s continued to promote policies that oppressed African Americans. This so-called Southern strategy has driven conservative politics and policy over the past 50 years, hurting African Americans to this day.5 Figure 1 shows a strong clustering of low mobility in the South and in certain parts of the industrial Midwest; it is not random that the areas with the lowest economic mobility are those with high populations of African Americans.
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A pizza
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I believe you mean food right? in public.