# Machine Learning: MCQs Set – 15

#### Q141: Computational complexity of Gradient descent is

• (A) linear in D
• (B) linear in N
• (C) polynomial in D
• (D) dependent on the number of iterations

#### Q142: The adjusted multiple coefficient of determination accounts for

• (A) the number of dependent variables in the model
• (B) the number of independent variables in the model
• (C) unusually large predictors
• (D) none of the above

#### Q143: Which of the following statements regarding the Gradient of a Continuous and Differentiable Function is false?

• (A) is zero at a minimum
• (B) is non-zero at a maximum
• (C) is zero at a saddle point
• (D) decreases as you get closer to the minimum

#### Q144: Which of the following is an example of a deterministic algorithm?

• (A) PCA
• (B) K-Means
• (C) KNN
• (D) None of the above

#### Q145: Batch Normalization is helpful because

• (A) It normalizes (changes) all the input before sending it to the next layer
• (B) It returns back the normalized mean and standard deviation of weights
• (C) It is a very efficient backpropagation technique
• (D) None of these

#### Q146: Which of the following are true about generative models?

• (A) They model the joint distribution P(class = C AND sample = x)
• (B) The perceptron is a generative model
• (C) They can be used for classification
• (D) Linear discriminant analysis is a generative model

• (A) Yes
• (B) No

#### Q148: After performing the Z-test, what can we conclude ____?

• (A) Listening to music does not improve memory.
• (B) Listening to music significantly improves memory at p
• (C) The information is insufficient for any conclusion.
• (D) None of the above

#### Q149: Assume you’re in the final round of the game show “Let’s Make a Deal,” and you have to pick between three doors – 1, 2, and 3. One of the three doors has a vehicle behind it, while the other two contain goats. Assume you select Door 1 and the host opens Door 3 to reveal a goat. Which of the following choices would you select to increase your chances of winning?

• (A) Switch your choice
• (B) Retain your choice
• (C) It doesn’t matter probability of winning or losing is the same with or without revealing one door.

#### Q150: Assume you’re participating in a game in which we throw a fair coin several times. You’ve already lost three times when you guessed heads but got tails. Which of the following statements is correct in this situation?

• (A) You should guess heads again since the tails has already occurred thrice and its more likely for heads to occur now
• (B) You should say tails because guessing heads is not making you win
• (C) You have the same probability of winning in guessing either, hence whatever you guess there is just a 50-50 chance of winning or losing
• (D) None of these