#feature-vectors

Question 1: Single choice

Trips are stored as vectors [distance in km, number of traffic lights]. A colleague appends a new trip as [4, 1.5], meaning 4 traffic lights and 1.5 miles. What is wrong?

Entries are read by position, so all vectors need one feature order and one unit1
Nothing, because a model can tell from the values which number is the distance2
Feature vectors may only contain whole numbers, and 1.5 is not one3
A single vector may not mix different kinds of quantity, such as counts and distances4

Timed test