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From a sample of 30 adults between the ages of 18 and 30 years of age was drawn. The sample mean indicates that this group

From a sample of 30 adults between the ages of 18 and 30 years of age was drawn. The sample mean indicates that this group averages 4 hours daily either texting or reading texts from friends. With a known standard deviation of 2 hours, what is the Upper Confidence Limit for a 95% Confidence Interval for this estimate of the mean?

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Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook

Authors: Dean Chalmers, Julian Gilbey

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