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In a random sample of seven aerospace engineers, the mean monthly income was $6824 and the...


In a random sample of seven aerospace engineers, the mean monthly income was $6824 and the standard deviation was $340.
a) Assume the monthly incomes are normally distributed and construct a 95% confidence interval for the population mean monthly income for aerospace engineers.
b) Calculate the two standard deviation interval and discuss the difference in meaning from it and the confidence interval from part a.
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