B2 - Interpreting Data On Disease Flashcards
What does a scatter diagram show?
Shows if there is a correlation between two variables.
One variable is plotted against a second variable, both variables have to be numbers.
What is NAFLD?
NonAlcoholic Fatty Liver Disease.
If two variables are positively correlated with each other what will the line of best fit look like?
The line best fit will incline upward.
What does a negative correlation look like?
As one variable goes up the other goes down.
What is the golden rule for interpreting a scatter diagram?
Correlation doesn’t = cause
How can data be illustrated? (4)
In a table
Bar graph
Scatter diagram
Histogram
What is it important to pay close attention to when interpreting data?
Titles in the table
Axis, labels on the graph
Units used.
Data can’t be collected from the whole population so we use a sample. What does this represent?
A sample represent the full potential data set.
Why is a bigger sample size better?
More likely that the different characters present in the whole of the population will be included in the sample
Why should a sample be random?
To avoid biased results
Explain why a large sample size is better when collecting data? (1 mark)
A bigger sample size means that more of the different characteristic present in the whole population will be is included in the sample
