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4) We want to know what percent of people get their coffee from a gas station. A random sample of 50 people found that 20%

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4) We want to know what percent of people get their coffee from a gas station. A random sample of 50 people found that 20% had gotten their coffee from the gas station. All conditions for inference have been met. a) What is the point estimate, the sample size and the critical z value for the sample? Point estimate: Sample size: Critical Z : Find a 90% confidence interval. Show your work

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