Determine confidence interval for the average yearly income

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Discussion 1: In a poll of 400 voters in a campaign to eliminate non-returnable beverage containers, 250 of the voters were opposed. Develop a 99% confidence interval estimate for the proportion of all the voters who opposed the container control bill.

Discussion 2: A random sample of 50 airline pilots had an average yearly income of $110,000 with a standard deviation of $10,000.

i. If we want to determine a 90% confidence interval for the average yearly income, what is the value of t? 2. Develop a 90% confidence interval for the average yearly income of all pilots.

Reference no: EM132596830

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