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Mary Noticed That Old Coins Are Smoother and More Worn

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Mary noticed that old coins are smoother and more worn.She weighed 31 nickels and recorded their age,and then performed a simple regression to estimate the model Weight = β0 + β1 Age where weight is the weight of the coin in grams and Age is the age of the coin in years.Her results are shown below.Write a brief analysis of these results,using what you have learned in this chapter.Make a prediction of Weight when Age = 10,and also when Age = 20.What does this tell you? Is the intercept meaningful in this regression? Mary noticed that old coins are smoother and more worn.She weighed 31 nickels and recorded their age,and then performed a simple regression to estimate the model Weight = β<sub>0</sub> + β<sub>1</sub> Age where weight is the weight of the coin in grams and Age is the age of the coin in years.Her results are shown below.Write a brief analysis of these results,using what you have learned in this chapter.Make a prediction of Weight when Age = 10,and also when Age = 20.What does this tell you? Is the intercept meaningful in this regression?

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