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please explain all the steps with formulas Recently a university surveyed recent graduates of Math department for their starting Salaries . Twenty graduates returned a

please explain all the steps with formulas
Recently a university surveyed recent graduates of Math department for their starting Salaries . Twenty graduates returned a Survey. The average salary for this sample was $15,000 . with a standard deviation of $ 3, 900. a . what is the best point estimate of the population mean . b. what is the 95 1. confidence interval for the mean salary of all graduates from Math depart

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