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In the 1980s it was generally believed that autism affected about 5% of the nation's children. Some people believe that the increase in the number of chemicals in the environment has led to an increase in the incidence of autism. A recent study examined 384 children and found that 46 of them showed signs of some form autism
Is this strong evidence that the level of autism has increased?
a) Write appropriate hypotheses.
b) Check the necessary assumptionsc) Perform the mechanics of the test. What is the Pvalue?d) explain what the pvalue means in the contexte) what is your conclusion?f) do environment chemicals cause autism?
What are the strength of Roosevelt's argument in "The Man with the Muck Rake" that hysterical and indiscriminate muckraking was doing more harm than good?
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What groups supported the Dred Scott case; what groups were upset by the courts findings?
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What kinds of authority Columbus exercised over the lands he discovers(america)? and what role he played by the monarch?
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