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Confidence interval for mean

It has the following information is known through a survey in 10 villages of the area south of Puerto Rico that the average time watching television per day is 6.4. Previous investigations have established that the standard deviation in the 10 villages was 1. The number of respondents was 100 persons.
a) Identify the punctual estimator
b) Find the confidence interval for 95%.
c) Interpret the results

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.