(Answered) Find the standard deviation of the sample proportion

Statistics

Problem: A survey of 300 CEOs finds that 189 of them think that the economy will improve next year. Is there evidence that the rate is higher among all CEOs than the 58% reported by the public at large?

Required:

Question 1: Find the standard deviation of the sample proportion based on the null hypothesis.

Question 2: Find the z-statistic.

Question 3: Does the z-statistic seem like a particularly large or small value?

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