Conceptual Questions.

a$.(12$ points$)$ Use $1-2$ sentences to explain the difference between a nominal attribute and

an ordinal attribute.

b$.(12$ points$)$ List and explain at least three techniques to handle noisy data in data

cleaning.

c$.(12$ points$)$ List at least four distinguishing features between OLTP $($online transaction

processing systems$)$ and OLAP $($online analytical processing systems$).$