<PRE><B>Question 437548</B>
Based on a sample of 34 randomly selected years, a 90% confidence interval for the mean annual precipitation in one city is from 47.7 inches to 50.3 inches. Find the margin of error. 
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The width of the confidence interval is
ALWAYS 2*ME.
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Your Problem:
2*ME = (50.3-47.7) = 2.6
ME = 1.3
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Cheers,
Stan H.</PRE>