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Confidence interval for mean calculations

How to calculate an 80% confidence interval for an average weight of 75 pounds for 100 children. The standard deviation is 5.

Point Estimate - 75
Sample - 100
Standard Deviation - 5

How do I calculate an 80% confidence interval.

Solution Summary

The solution provides step by step method for the calculation of confidence interval for mean . Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.