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please show work 1. A random sample of 35 financial analysts shows an average salary of $150000 with sample standard deviation of $15000. Find 95%

please show work

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1. A random sample of 35 financial analysts shows an average salary of $150000 with sample standard deviation of $15000. Find 95% confidence interval for mean salary of all financial analysts. 2. If the mean noise level of 84 hospitals was 61.2 decibels with standard deviation of 7.9 decibels. Find 90% confidence interval for the population mean

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