Data Analysis - Central Tendancy and Dispersion

Question 1

What is the mean - + strengths and limitations

Answer 1

An average calculated by adding up all the data and dividing by how much there is.
+ representative- takes into account all data
- outliers make it unreliable and misleading

Question 2

What is the median - + strengths and limitations.

Answer 2

The middle value calculated by putting all of the data into numerical order and finding the middle number.
+ cannot be skewed by outliers
- less representative

Question 3

What is the mode - + strengths and limitations

Answer 3

Most common number in the data.
+ cannot be skewed
- there isn’t always a mode

Question 4

What is the range - + strengths and limitations

Answer 4

The highest number minus the lowest number.
+ easy to calculate
- doesn’t take much data into account
- not very useful

Question 5

What is Standard Deviation - + strengths and limitations

Answer 5

Calculates how much each score differs/ deviates from the mean on average. Low scores = reliable High scores = unreliable
+ includes all values
+ precise
- can be affected by extreme results