Question

a)What two important features do we use to describe the shape of a scatter diagram?

b)What are the five characteristics of graphical excellence?

c). Name two (or more) methods of graphical deception.

Answer 1

a)The scatter diagram graphs pairs of numerical data, with one variable on each axis, to look for a relationship between them. If the variables are correlated, the points will fall along a line or curve. The better the correlation, the tighter the points will hug the line.

Features

1) When some association or relationship exists between two variables, a scatter plot can indicate the direction of the relationship.

2) A scatter plot can indicate the presence or absence of an association or relationship between two variables.

b)

1)Graphic excellence is the well-designed presentation of interesting data, and it is a matter of statistics, of substance and design.
2)Graphic excellence consists of ideas communicated with clarity, precision and efficiency.

3)To communicate to the user the most number of ideas in the shortest time and least link in the smallest spaces possible.

4) Is nearly always multi variate
5 )Tells the truth about the data.

c)

In statistics, a misleading graph, also known as a distorted graph, is a graph that misrepresents data, constituting a misuse of statistics and with the result that an incorrect conclusion may be derived from it. ... Misleading graphs are often used in false advertising.

Ratio between horizontal and vertical scale
 If the bars are not equal widths
 If it’s a pictogram, then all of the pictured items may not be
the same size.
 Beware of 3D graph
 Misleading scatter diagram