✅ Quiz M1.03

Question

How are categorical variables represented?

• a) categorical feature is only represented by non-numerical data

• b) categorical feature represents a finite number of values called categories

• c) categorical feature can either be represented by numerical or non-numerical values

Select all answers that apply

Question

An ordinal variable:

• a) is a categorical variable with a large number of different categories;

• b) can be represented by integers or string labels;

• c) is a categorical variable with a meaningful order.

Select all answers that apply

Question

One-hot encoding:

• a) encodes each column with string-labeled values into a single integer-coded column

• b) transforms a numerical variable into a categorical variable

• c) creates one additional column for each possible category

• d) transforms string-labeled variables using a numerical representation

Select all answers that apply

Question

Assume we have a dataset where each line describes a company. Which of the following columns should be considered as a meaningful numerical feature to train a machine learning model to classify companies:

• a) the sector of activity (“construction”, “retail”, “energy”, “insurance”…)

• b) the phone number of the sales department

• c) the number of employees

• d) the profits of the last quarter

• e) the post code of the head quarters

Select all answers that apply