KEYWORDS UNIT 1 AND 2 Flashcards
What is discrete data
Gathered by counting, eg shoe size
What is a variable
A quantity that has the potential to change
What is continuous data
A continuous variable can have any value on a scale. You can never measure the exact value of a continuous variable
What is categoric data
Has values that can be sorted into categories eg colours of solutions may be blue,green,red….
What is ordered (ordinal) data
Similar to categoric but categories put in order, eg if you classify reactions as slow, fairly fast and very fast you have ordered them
What is an anomalous result
A value that doesn’t fit in with the other values and is likely to be wrong. These should be ignored when you calculate the average
When are line graphs used
When you have two sets of continuous data
When is a bar chart used
When one of your data sets is categoric or ordered data
When is a scattergram used
To show how to sets of data are related (or correlated)
What is correlation
It describes the relationship between 2 variables , the IV and DV
When are pie charts used
When you have categoric data
Define accuracy
Results that are really close to the true answer
Define precision
Results taken using sensitive instruments that measure in small increments
Define valid
The results answer the original question
Define reliability
Results are consistently reproduced in independent experiments
