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(2) Here are summary statistics for randomly selected weights of newborn girls: n= 177 , x= 30.8 hg , s= 6.4 hg . Construct a

(2) Here are summary statistics for randomly selected weights of newborn girls:

n= 177, x= 30.8 hg, s= 6.4 hg. Construct a confidence interval estimate of the mean. Use a 98% confidence level. Are these results very different from the confidence level interval 29.1 hg < < 31.7 hg with only 19 sample values, x= 30.4 hg, and s= 2.2 hg?

What is the confidence interval for the population mean of ?

( ) hg < < ( )

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