Week 2 - Data Visualisation & Presentation

Question 1

What does a summary table do?

Answer 1

gives the frequency, proportion or percentage of the data in each category, which allows you to see the differences between the categories.

Question 2

Define bar chart?

Answer 2

is a graphical representation of a summary table for categorical data; the length of each bar represents the proportion, frequency or percentage of data values in the category.

Question 3

Define pie chart?

Answer 3

is a graphical representation of a summary table for categorical data, with each category represented by a slice of a circle of which the area represents the proportion or percentage share of the category relative to the total of all categories.

Question 4

Define frequency distribution?

Answer 4

is a summary table in which the data are arranged into numerically ordered classes or intervals.

Question 5

Define class width?

Answer 5

is the distance between upper and lower boundaries of a class.

Question 6

What is the formula for class width?

Answer 6

Class width = range/number of classes

Question 7

Define Range?

Answer 7

is the distance measure of variation; the difference between the maximum and minimum data values.

Question 8

Define class boundaries?

Answer 8

are the upper and lower values used to define classes for numerical data.

Question 9

What is the class mid-point?

Answer 9

is the centre of a class; the representative value of the class.

Question 10

Define relative frequency distribution?

Answer 10

is a summary table for numerical data which gives the proportion of data values in each class.

Question 11

Define percentage distribution?

Answer 11

is a summary table for numerical data which gives the percentage of data values in each class.

Question 12

Define cumulative percentage distribution?

Answer 12

is a summary table for numerical data that gives each successive class’s cumulative frequency.

Question 13

Define histogram?

Answer 13

is a graphical representation of a frequency, relative frequency or percentage distribution; the area of each rectangle represents the class frequency, relative frequency or percentage.

Question 14

Define percentage polygon?

Answer 14

is a graphical representation of a percentage distribution.

Question 15

Define cumulative percentage polygon?

Answer 15

is a graphical representation of a cumulative frequency distribution.

Question 16

Define scatter diagram?

Answer 16

is a graphical representation of the relationship between 2 numerical variables; plotted points represent the given values of the independent variable and corresponding dependent variable.

Question 17

Define time-series plot?

Answer 17

is a graphical representation of the value of a numerical variable over time.