7. Use Figures 3.14 and 3.15 to identify a characteristic shared by the petal width and petal length attributes. 8. Describe the types of situations that produce sparse or dense data cubes. Illustrate with examples other than those used in the book. 9. Construct a data cube from Table 3.14. Is this a dense or sparse data cube? If it is sparse, identify the cells that empty. Table 3.14 Fact table for Exercise 16 Product ID Location ID Number Sold 10 10. Discuss the differences between dimensionality reduction based on aggregation and dimensionality reduction based on techniques such as PCA and SVD 7. Use Figures 3.14 and 3.15 to identify a characteristic shared by the petal width and petal length attributes. 8. Describe the types of situations that produce sparse or dense data cubes. Illustrate with examples other than those used in the book. 9. Construct a data cube from Table 3.14. Is this a dense or sparse data cube? If it is sparse, identify the cells that empty. Table 3.14 Fact table for Exercise 16 Product ID Location ID Number Sold 10 10. Discuss the differences between dimensionality reduction based on aggregation and dimensionality reduction based on techniques such as PCA and SVD