data representation and interpretation

What is discrete data?

Data that can only take certain values ( e.g - number of goals in a football match)

What is continuous data?

Data that can take any value ( e.g - height, time)

What is quantitative data?

Data which is descriptive ( e.g - eye colour, subjects)

What are the key components to a bar chart?

• Should have gaps

• Often represent proportions

What are key components to a pie chart?

• Often represent proportions ( cannot make comments until we know the total frequency)

What are the key components of a histogram?

• Used for continuous data

• Area is proportional to the frequency

What does this histogram represent?

Positive skew

What does this histogram represent?

Symmetric distribution

What does this histogram represent?

Negative skew

What are the key components to a cumulative frequency graph?

• Used for grouped data and is plotted at the end of each group

• Used for estimates, such as median, quartiles, percentiles

What are the key components to box plots?

• Good for direct comparisons between two sets of data, as they show the median and IQR

• Can determine skew

What does this box plot represent?

Positive skew

What does this box plot represent?

Symmetric distribution

What does this box plot represent?

Negative skew