Presenting Data Flashcards
What is qualitative data.
Non-numerical data/categorical.
Blood group.
Hair colour.
What is discrete data?
Numerical data that can only take certain values in a range.
Shoe size.
Number of patients.
How can you present qualitative and discrete data?
Using bar charts and pie charts.
What do you put on y axis?
The thing being measured.
What do you put on x axis?
The categories.
When completing a bar chart, what do you need to ensure?
Y and X axis are labelled.
Width of each bar is the same.
Bars evenly spaced out.
What is continuous data?
Data that can take any value in a range.
Height.
Weight.
How can you present continuous data?
Line graph.
Histograms.
What do line graphs show?
How a variable changed over time.
Data on both axes is continuous.
What do histograms do?
Display frequency when the independent variable is continuous.
The area of the bar represents frequency
Height of each bar is called the frequency density.
Formula for frequency density.
Frequency density = frequency divided by class width.
What are do scattergraphs show?
How 2 variables are related.
Both variables much be numbers.
Never join crosses on graph.
However, you can draw a line of best fit to see the the correlation.
What does a line of best fit show?
The overall trend not the individual changes.
What is rate a measure of?
How much something is changing over time.
Formula for gradient.
Gradient = change in y divided by change in x.
