Quiz2

1.

A data-point in a dataset can be written as [1, 1, 1]. What is the dimensionality of this dataset?

Answer

  • ☑ 3
  • ☐ 1
  • ☐ 2
  • ☐ 0

2.

Vectors are generally represented as:

Answer

  • ☑ column vector
  • ☐ linked-list
  • ☐ matrix
  • ☐ row vector

3.

Which of the following is true about a statistic?

Answer

  • ☑ Parameter of the population estimated from samples
  • ☐ Parameter of the population estimated by the entire population
  • ☐ geoemetric view in 1D
  • ☐ geometrix view in 2D

4.

Which of these statements is false

Answer

  • ☑ In geometric view, each attribute is a random variable
  • ☐ In geometric 2D, each data-point is a vector
  • ☐ In probablilitic view, parameters are estimated
  • ☐ For continuous attributes, mean of an attribute is expressed as an integration \(\int_{-\infty}^{\infty}xp\left(x\right)dx\)

5.

Which of the following is false

  • ☐ Correlation measures linear relationships
  • ☐ Cos(θ) is a measure of similarity
  • ☐ Euclidean distance is a good measure for geometric distances
  • ☑ Covariance is normalized correlation