Lecture 3

Question 1

Graph

Answer 1

Visual representation of a relationship between two or three variables

Question 2

Bar Graph

Answer 2

Vertical or horizontal columns representing the distribution of a numerical variable against one or more categorical variables

Question 3

Explanatory variable

Answer 3

Predicts or affects the other variable, called the response variable

Question 4

Scatter plot

Answer 4

Graphical display of two numerical variables which each observation is represented as point on a graph with two (or three) axes
-Can have multiple series

Question 5

Line Graph

Answer 5

Uses dots connected by line segments to display trends in a measurement over time or other ordered states

Question 6

Number of intervals should be used?

Answer 6

No strict rules but some rules, like Sturges’ rule:

n.intervals=1+ln(n)/ln(2)

Question 7

Mode

Answer 7

Interval corresponding to the highest peak in the frequency distribution