Description of the data set is provided in page 161 (problem 12 in chapter 8). Dataset “EX0812.txt” is posted. (Note: If you use infile and input statement to read in data, put “$” after the variable sex to indicate that the values are characters. E.g. input id x1 x2 y clrzne sex $ ;) Fit the regression model of Y (change in refraction error) on X1, sex and X1*sex. Write down the fitted regression model.Based on the fitted model in (a), write down the regression models of Y on X1 for males and females separately. What is the difference of intercepts in these two models? What is the difference of slopes in these two models? Which do they correspond to the estimated coefficient in model (a), respectively?Test whether the straight lines for males and females coincide (i.e., are the same) with alpha=0.1. State your null hypothesis in terms of the coefficients. Provide you SAS code and output for conducting the analysis. Figure out your F value and p value based on output, and then draw a conclusion.Test whether the straight lines for males and females are parallel with alpha=0.1. State your null hypothesis in terms of the coefficients. Provide you SAS code and output for conducting the analysis. Figure out your F value and p value based on output, and then draw a conclusion.Based on your answers to questions (c) and (d), comment on differences and similarities in the change in refraction-baseline refractive error relationship for males and females.

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Part 1Global Stratification1. What is Global Stratification? please quote from the textbook ( text book is attached, read chapter# 9) . (1 point)2. Compare and contrast World System Theory with Neocolonialism. What are some strengths and some weakness of these two theories? Please quote the textbook and apply one theory to a country of your choice. (2 points)Reply to another student (2 pts)Part 2What are three types of social mobility present in the American Society? Give at least one example of each mobility. Gender Inequality: What is Glass Ceiling? How does it apply to women? Please quote the textbook( text book is attached under "Part 2" ). (3 pts)Each student is required to reply to at least one other student. (2 pts)