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Historically, 57% of adults believed that global warming was an issue caused by humans. A March 2017 Gallup poll randomly sampled 382 adults and found

Historically, 57% of adults believed that global warming was an issue caused by humans. A March 2017 Gallup poll randomly sampled 382 adults and found that 250 believe that global warming was an issue caused by humans. Using a significance level of 0.05, test the claim that the proportion of adults who agree with the statement has changed

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