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Suppose that 42% of Americans are obese. A) If 100 people are randomly selected, what is the
probability that more than 70% are obese? B) If 400 people are randomly selected, what is the
probability that less than 30% are obese? C) A USA Today Poll asked a random sample of 1000
adults what they do with the milk in the bowl after they have eaten the cereal. 70% said they
drink it. What is the 95% confidence interval for the population proportion?

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Probability of obesity rates and confidence intervals for surveys

  • 1. Suppose that 42% of Americans are obese. A) If 100 people are randomly selected, what is the probability that more than 70% are obese? B) If 400 people are randomly selected, what is the probability that less than 30% are obese? C) A USA Today Poll asked a random sample of 1000 adults what they do with the milk in the bowl after they have eaten the cereal. 70% said they drink it. What is the 95% confidence interval for the population proportion?