Spread of data Flashcards
1
Q
What data is standard deviation appropriate for?
A
Metric data
2
Q
Define standard deviation
A
A measure of the average distance of all of the data values from the mean
3
Q
What does a large standard deviation show?
A
The further away the values are collectively from the mean= more spread out data values.
4
Q
What is Q1 and Q3?
A
Q1= The value for which 25% of individuals have values that are less Q3= The value for which 75% of individuals have values that are less
5
Q
What is the interquartile range?
A
- Upper quartile - lower quartile
- Used as a measure of spread for continuous and discrete metric variables and also for ordered variables.
6
Q
With what data is normally distributed & skewed data described
A
- Normally distributed= mean & standard deviation
- Skewed data= median & interquartile range
7
Q
With non-normally distributed variable-skewed data what would be the average?
A
Median
8
Q
How would you check on the distribution of a continuous variable? (type of graph used)
A
Histogram-frequency plot
