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Database - Data Mining

Avatto > > UGC NET Management > > PRACTICE QUESTIONS > > International Business , Data Mining , DataWarehousing, Artificial Intelligence > > Database > > 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?

A
1 Unit
B
By slope
C
By intercept
D
None

Answer
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Option : B
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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

A
Y = 3.39x + 11.62
B
Y = 4.69x + 12.58
C
Y = 4.59x + 12.58
D
Y = 3.59x = 10.58

Answer
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Option : C
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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?

A
Low bias, high variance
B
Hight bias, low variance
C
Low bias, low variance
D
High bias, High variance

Answer
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Option : A
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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

A
a only
B
b only
C
both a and b
D
None of the above

Answer
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Option : A
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60. K-Nearest Neighbor is a ____ , _____ algorithm

A
Non-parametric, eager
B
Parametric, eager
C
Non-parametric, lazy
D
Parametric lazy

Answer
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Option : C
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