The Normal Distribution And Standardising Data Flashcards
1
Q
What is standard deviation
A
The average based on the distance of values from the mean
Often reported in brackets after the mean
2
Q
What is a normal distribution
A
Standard bell shaped curve
Median = mean
Most data close to mean
Curve never touches x axis
3
Q
Explain different shaped normal curved
A
Tall and thin = more data close to mean
Wider = larger standard deviation
4
Q
What must we do if we can’t report a value because it is an error
A
Report a missing value
5
Q
Why else why would we need to change data
A
Transform data, so it is the same scale
Standardise eg gender
6
Q
What is the other word for normal curve
A
Gaussian
7
Q
What is the total area under the curve
A
1
Half the area above the mean (0.5)
Half the area below the mean (0.5)
