3. Representations of data Flashcards
1
Q
How do you calculate outliers?
A
Large outliers: Q3 + k (Q3 - Q1)
Low outliers: Q1 - k (Q3 - Q1)
2
Q
What is the difference between outliers and anomalies?
A
Outliers: unusual yet legitimate values, could still be correct
Anomalies: clear errors, would mislead the data if it was kept in, can be a result of experimental or recording errors
The process of cleaning anomalies is known as cleaning the data
3
Q
What are the features of a box plot?
A
Lowest value Lower quartile Median Upper quartile Highest value Anomalies are represented by a cross on the graph
4
Q
What are cumulative frequency graphs?
A
When the frequencies form a line graph
5
Q
How do you compare data?
A
Comment on:
A measure of location
A measure of spread
E.g. mean and standard deviation or median and interquartile range
6
Q
What is the equation for histograms?
A
Frequency = frequency density X class width
