Bonus assignment

1. Clearly describe the data set and the sampling design.
   94.5,93,91,89,96.5,88
   89,90,92.5,88.5,91.5,91.5
   88.5,93.5,93.5,88,92.5,91.5
   100,99,100,98,95,97.5
   91.5,93,90,92.5,89,91
   98.5,100,98,100,96.5,98
   
2. Explain the proposed random effects model. Compare it with the usual one-way layout anova model.
3. Aswer to the questions a and b stated in the problem.
4. Apply an anova test to see if there is a significant difference between the batch means.
5. Study the residuals. Does the normality assumption seem adequate?

• Present your report in a nice readable form.
• Language: english or swedish.
• When submitting electronically send your report as a single postscript file or pdf file.