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1.A survey of 15 data scientists in Sydney shows that their average annual income is $140000. Assume that the population standard deviation is $8000, and

1.A survey of 15 data scientists in Sydney shows that their average annual income is $140000. Assume that the population standard deviation is $8000, and the annual incomes are normally distributed. Compute the 90% confidence interval of the average annual income of all data scientists in Sydney.

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