1.Use the HSB data set to answer the following questions on comparing the writing scores (WRTG) for the three socio-economic groups (SES).

(a) Perform an overall test for comparing the means for the three levels of SES. Report the value of the test statistics and its corresponding p-value. Specify the null and the alternate hypotheses that are being tested, and clearly state the conclusion of the test in the context of the problem (you may use ? = .05).

(b) If you see any difference in part (a),using the Tukey method find out where the differences are. Specify the null and the alternate hypotheses that are being tested, for each comparison. Use ? = .05