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Home Q & A Board Science-Related Homework Help Mathematics
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zns889 zns889
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6 years ago Edited: 2 years ago, bio_man
A random sample of 87 airline pilots recruited by an airline service had an average yearly income of 99,400 with a standard deviation of 12,000.

a. Determine a 90% confidence interval?

b. Develop a 95% confidence interval for the average yearly income of all pilots.

c. If the researcher would like to maintain the same margin of error as part (b) size would be necessary to be 99% confident?
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FredioFredio
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zns889 Author
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6 years ago
Smart ... Thanks!
SlimyPencil
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Yesterday
Good timing, thanks!
aricketts6@
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2 hours ago
This calls for a celebration Person Raising Both Hands in Celebration
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