Question

What steps do I take to solve this? I am a beginner. I don't want the answers

A random sample of 87 airline pilots had an average yearly income of $99,400 with a standard deviation of $12,000.
• If we want to determine a 95% confidence interval for the average yearly income, what is the value of t?
• Develop a 95% confidence interval for the average yearly income of all pilots.

Answer 1

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