Question: . A random sample of 80 observations produced a mean ?????= 35.4 and a standard deviation s = 3.1. a. Find a 90% confidence interval

. A random sample of 80 observations produced a mean ?????= 35.4 and a standard deviation s = 3.1. a. Find a 90% confidence interval for the population mean ?. (3 points) b. Find a 95% confidence in...

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