A random sample of 60 items is taken producing a sample mean of 25 and a sample standard deviation of 12.25. What is the value for 95% confidence interval to estimate the population mean?

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We have been given

Standard deviation,d=12.25

The critical value for the 95% confidence interval is,Z= 1.96

The confidence interval is given by the formula,

Lower limit=21.9

Upper limit=28.1

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