Questions of final exam

The number of entries in a primary index is equal to:

• A. The number of records in the data file

• B. The number of distinct values in the indexed column/field

• C. The number of blocks in the data file.

• D. The number of fields in the data file

Which of the following is not true statement about a clustering index?

• A. it is a dense index.

• B. each index entry is in the form of

• C. it allows binary search on the indexed file.

• D. it is defined on an ordered data file

Blocks of records pointers are typically used with which of the following indexes:

• A. Secondary index

• B. Clustering index

• C. Primary index

• D. Book index

Which of the following is a false statement about linear regression?

• A. It is used for prediction

• B. it uses one or more coefficients

• C. it uses one or more variables

• D. The intercept must be positive

Which of the following methods is used to model the probability of a certain class taking place, and is used in environments where the dependent variable is categorical ?

• A. k-means clustering

• B. stemming

• C. linear regression

• D. logistic regression

Which of the following is a true statement about text data.

• A. it is unstructured

• B. it is structured

• C. it is numerical

• D. it is categorical

Which of the following is a false statement about LAT?

• A. It is used together in combination with hypothesis generation

• B. It is used to estimate the confidence level for different

• C. It is the "Lexical Answer Type"

• D. It is a word/noun that specifies the type of the answer

K-means clustering is considered as an example of which kind of the following clustering methods?

• A. Density-based Clustering

• B. Fuzzy Clustering

• C. Hierarchical clustering

• D. Centroids-based Clustering

Which of the following is not a true statement about a clustering index:

• it is a dense index

• it allows binary search on the indexed field

• it is defined on an ordered data file

Blocks of record pointers are typically used with of the following indexes :

• Secondary index

• Primary index

• Clustering index

• Book index