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A random sample of 144 observations has a mean of 20, a median of 21, and...

A random sample of 144 observations has a mean of 20, a median of 21, and a mode of 22. The population standard deviation is known to equal 3.6. The 90% confidence interval for the population mean is

19.62 to 20.38

19.51 to 20.49

19.41 to 20.59

19.30 to 20.70
            
Math   Statistics-And-Probability   
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