Types of Data
Values are always numbers
Only write the last digit on each row
What do you do in a stem-and-leaf plot?
The most common data point
What is the mode?
A random number generator
What might generate a uniform distribution?
Values are always labels, usually words
What is categorical data?
Shows a count of categorical responses
What is a column/bar chart?
Take a middle value of a sorted list
The heights of a large number of people
What might generate a normal distribution?
Number values which must be whole numbers
What is discrete numerical data?
Looks like a column graph, but no spacing between columns
What does a histogram look like?
Add up all values and divide by sample size
How do you calculate a mean?
The number of siblings of people in Australia
What might generate a positively skewed distribution?
Number values which can be non-integers
What is continuous numerical data?
Shows change of a value over time
What is a time-series/line plot?
Sensitive to extreme values
What is one characteristic of the mean?
A country with many elderly people and few young people
What might generate a negatively skewed distribution?
e.g. Room 101, Room 102, Room 103...
What is an example of ordinal categorical data?
Bins/Buckets
What are the grouped sets in a histogram called?
Bimodal
What's the word to describe a distribution with 2 modes?
The median is to the left of the mean.
What would be true for a positively skewed distribution?