Wednesday, June 10, 2020

Machine Learning Exam Questions TRUE or FALSE 13

Machine learning quiz questions TRUE or FALSE with answers, important machine learning interview questions for data science, Top 3 machine learning question set, ML exam questions

Machine Learning TRUE / FALSE Questions - SET 13

1. A cumulative distribution function (CDF) cannot be less than 0 or bigger than 1.

(a) TRUE                                                   (b) FALSE

Answer: TRUE

It is a probability function. It can be in the range of 0 to 1.

Cumulative Distribution Function (CDF) is a method to describe the distribution of random variables. It can be used to define different kinds of random variables including discrete, continuous, and mixed.


2. K-Means Clustering is guaranteed to converge (i.e., terminate).

(a) TRUE                                                   (b) FALSE

Answer: TRUE

K-means clustering is guaranteed to converge to a local minimum.

Since the loss function is non-negative, the k-means algorithm will eventually converge when the loss function reaches its (local) minimum.


3. Nearest neighbors is a parametric method.

(a) TRUE                                                   (b) FALSE

Answer: FALSE

Nearest neighbors is a non-parametric method.

That is, the method can be used even when the variables are categorical.


4. K-medoids is a kind of agglomerative clustering.

(a) TRUE                                                   (b) FALSE

Answer: FALSE

K-medoids is a partitioning clustering algorithm.


5. Performing K-nearest neighbors with K = N yields more complex decision boundaries than 1-nearest neighbor.

(a) TRUE                                                   (b) FALSE

Answer: FALSE

In k nearest neighbors, k=1 increases the complexities.

Increasing “k” simplifies decision boundary.

K = 1 (complex)

K = N: always predict majority class in dataset. (simple)

As k increases, we are averaging over more neighbors–the effective decision boundary is more “smooth”.



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