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ECMM445
COMPUTER SCIENCE
Duration: TWO HOURS + 30 MINUTES UPLOAD TIME
Answer ALL questions.
Please use EXAM ANSWER SHEET for writing your answers.
The marks for this module are calculated from 60% of the percentage mark for this paper plus 40% of the
percentage mark for associated coursework.
This is an Open Book exam
ECMM445
Section 1: Multiple Choice Questions
There are two types of questions:
• [Select one answer only]: you must select one and only one answer. Selecting more or less than
one answer will result in ZERO marks.
• [Select all the correct statements]: in these questions you must select the correct answers only.
Selecting more or less than correct answers will result in ZERO marks.
1- What methods could be used to help reduce overfitting in decision trees? [Select all the correct
statements].
☐ A) Pruning.
☐ B) Enforce a minimum number of samples in leaf nodes.
☐ C) Make sure that each leaf-node is one pure class.
☐ D) Make sure that your data is normalized.
☐ E) Enforce a maximum depth for the tree.
☐ F) Use “entropy” to calculate the information gain.
(2 marks)
2- Which of the following statements about Neural Networks is/are true? [Select all the correct
statements].
☐ A) Optimize a convex cost function.
☐ B) Always output values between 0 and 1.
☐ C) Can be used in an ensemble.
☐ D) Can be used for regression as well as classification.
(2 marks)