gs gs119 Data Preprocessing - Data Cleaning and Data Integration - Quiz No.3
gs gs119 Data Science Quiz
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Question 1: What are the expected values for the attributes No. of hours studied and Marks scored?
| Student | No of hours Studied | Marks Scored |
|---|---|---|
| 1 | 5 | 80 |
| 2 | 6 | 82 |
| 3 | 10 | 95 |
7, 85.6
8, 87.2
9, 76.9
5, 67.8
Question 2: What is the covariance between the attributes No. of hours studied and Marks scored for the given data?
| Student | No of hours Studied | Marks Scored |
|---|---|---|
| 1 | 5 | 80 |
| 2 | 6 | 82 |
| 3 | 10 | 95 |
Positive
Negative
No relation
Zero covariance
Question 3: Covariance between two attributes is termed as variance when the two attributes are _____
Identical
Different
Binary
Nominal
Question 4: If Sa represents the standard deviation of the attribute a, Cov (a, b) represents the covariance between attributes a and b, the correlation coefficient for the two attributes is given by _____
Cov (a, b)/ Sa Sb
Cov2 (a, b)/ Sa Sb
Cov (a, b)/ S2a S2b
Cov2 (a, b)/ S2a S2b
Question 5: Which of the following is not an example of data value conflicts?
Height in meters in one database and in centimeters in the other
Currency in dollars in one database and in rupees in the other
Weight in kilograms in one database and in kilograms in the other
Grading as 1 to 4 I one university database and as A to D in the other
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