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Problem 1


7.5 Small-Sample Confidence Intervals for a Population Mean

A sample of 28 healthy babies has an average birth weight of 6.83 lbs and a standard deviation of 1.53 lbs.  Construct a 95% confidence interval for the true average weight for healthy babies.  If another study revealed that babies exposed to cocaine prenatally had an average birth weight of 4.92 lbs, does it seem that cocaine might lead to lower than normal birth weights? 


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