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Please check this out experts, should I use z or t? please provide me an exact answer with explanation. A random sample of 40 people

Please check this out experts, should I use z or t? please provide me an exact answer with explanation.

A random sample of 40 people who owned their own business reported a yearly mean profit of $10,860 with a standard deviation of $1,448. Find the 92% confidence interval for the population mean.(Round your answers to the nearest dollar)

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