Posted: November 26th, 2016

Please, determine the confidence interval for the difference in the mean in both groups, and decide, if the population mean difference is statistically significant or not.

 

  • In the presented data set, the mean for the cord blood lead level for the newborns was calculated. The following results were determined: n=26; =9.17 µg/dL; and s=3.86 µg/dL.

 

Using this result, please estimate the confidence interval for the population mean for the cord blood lead level in all newborns, assuming a 95% level of confidence.

 

  • When comparing the mean for the cord blood lead level for the newborns for mothers who don’t work and for those who work, we get the following table:

 

 Sample size

n

Mean

St. Deviation

s

Housewives126.853.27
Working Mothers1411.163.22
Total26  

 

Please, determine the confidence interval for the difference in the mean in both groups, and decide, if the population mean difference is statistically significant or not.

 

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