gs gs119 Data Preprocessing - Data Cleaning and Data Integration - Quiz No.2
gs gs119 Data Science Quiz
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Question 1: The consecutive rule for an attribute specifies that _____
Each value of the attribute should be an integer
Each attribute value should be greater than the previous value
There are no missing values between the lowest and highest values
The mean, median and mode values should be unique
Question 2: The null rule for an attribute specifies _____
The data values should not be null
All the data values should be null
The conditions and handling of null values
At most one null value is allowed
Question 3: Data scrubbing tools do not _____
Use domain knowledge
Detect errors
Make correction in the data
Decrease the size of the metadata
Question 4: Data auditing tools do not _____
Discover rules and relationships in the data
Detect data that violate certain rules
Use statistical analysis to find rules in the data
Use parsing to find rules in the data
Question 5: ETL (Extraction, Transformation, Loading) tools _____
Allow the use of graphical user interface
Do not allow the use of graphical user interface
Do not allow data transformations
Are not used for data transformations
Question 6: Entity identification problem is _____
To identify equivalent entities in multiple data sources
To identify different entities in multiple data sources
To identify non useful entities in multiple data sources
To identify nominal entities in multiple data sources
Question 8: In the following contingency table, which of the following is the expected frequency of the cell representing (male, football)?
| Likes Football | Likes Cricket | Total | |
|---|---|---|---|
| Male | 30 | 20 | 50 |
| Female | 40 | 10 | 50 |
| Total | 70 | 30 | 100 |
20
25
30
35
Question 9: How many degrees of freedom does the given data possess?
| Likes Summer | Likes Winter | Total | |
|---|---|---|---|
| Male | 30 | 70 | 100 |
| Female | 60 | 40 | 100 |
| Total | 90 | 110 | 200 |
1
2
3
4
Question 10: Which of the following is the chi square value for the given data?
| Likes Football | Likes Cricket | Total | |
|---|---|---|---|
| Male | 30 | 20 | 50 |
| Female | 40 | 10 | 50 |
| Total | 70 | 30 | 100 |
2.2
3.7
5.3
4.8
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