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Q:

Suppose we have generated the data with help of polynomial regression of degree 3 (degree 3 will perfectly fit this data). 

Simple Linear regression will have high bias and low variance

  1. Simple Linear regression will have low bias and high variance
  2. polynomial of degree 3 will have low bias and high variance
  3. Polynomial of degree 3 will have low bias and Low variance

A. Only 1

B. 1 and 3

C. 1 and 4

D. 2 and 4

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Solution: C

If we fit higher degree polynomial greater than 3, it will overfit the data because model will become more complex. If we fit the lower degree polynomial less than 3 which means that we have less complex model so in this case high bias and low variance. But in case of degree 3 polynomial it will have low bias and low variance.

 

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