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Database MCQ - Data Mining

56 Consider a simple linear regression model with One independent variable (X). The output variable is Y. The equation is: Y = aX+b where a is the slope and b is the intercept. If we change the input variable (X) by 1 unit, by how much output variable (Y) will change?

57 The following table shows the results of a recently conducted study on the correlation of the number of hours spent driving with the risk of developing acute backache. Find the equation of the best fit line for this data.

Number of hours spent driving (x)	Risk score on a scale of 0-100 (Y)
10	95
9	80
2	10
15	50
10	45
16	98
11	38
16	93

Choose which of the option is correct

58 You have generated data from a 3-degree polynomial with some noise. What do you expect of the model that was trained on this data using a 5-degree polynomial as function class?

59 Pruning is a technique that reduces the size of decision trees by removing sections of the tree that provide little power to classify instances. This is done in order to avoid:
a. overfitting
b. underfitting

60 K-Nearest Neighbor is a ____ , _____ algorithm

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Question:

Hidden knowledge referred to

A. A set of databases from different vendors, possibly using different database paradigms
B. An approach to a problem that is not guaranteed to work but performs well in most cases
C. Information that is hidden in a database and that cannot be recovered by a simple SQL query.
D. None of these

Correct answer: C

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