For a certain urban area, it was found that in a random sample of 4 months, an
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For a certain urban area, it was found that in a random sample of 4 months, an average of 31 burglaries occurred each month. The standard deviation was 4. Assume the variable is normally distributed. Find the 90% confidence interval of the true mean number of burglaries each month.
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Related Book For 
Elementary Statistics A Step By Step Approach
ISBN: 9780077665807
9th Edition
Authors: Allan G. Bluman
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