(Solved): Your friend, who took statistics a few years ago, recently read a study which examined whether the ...

Your friend, who took statistics a few years ago, recently read a study which examined whether there is any difference between the average birth weights of babies born to smoking mothers vs. non-smoking mothers. Your friend asked you to remind him what it means when the study says " a 95\% confidence interval for the difference between the average birth weight from non-smoking mothers and smoking mothers $$\left({?}_{non}?{?}_{smoke}\right)$$ is $$0.2$$ to $$0.9$$ pounds." Of the following possible responses to your friend's question, which is true according to the study? The study's authors are $$95\%$$ confident that babies born to non-smoking mothers are on average $$0.2$$ to $$0.9$$ pounds lighter than babies born to smoking mothers. The study's authors are $$95\%$$ confident that babies born to non-smoking mothers are on average $$0.2$$ to $$0.9$$ pounds heavier than babies born to smoking mothers. The study data does not provide convincing evidence (at $$5\%$$ significance level) of a difference between the average birth weight from smoking mothers and non-smoking mothers. The study data does not provide convincing evidence (at $$10\%$$ significance level) of a difference between the average birth weight from smoking mothers and non-smoking mothers.