Normal distribution Flashcards
Gvesome of the properties of a normally distribute set of data
- Bell shaped
- Symmetrical
- Mean median mode are equal
Give examples of characteristics that follow normal distribution
Height
Weight
Age
Bone density
What determinesteh shape of the normal curve?
Mean and standard deviation
Whatdoes the mean give us in a normally distributed set of results?
Mean gives the location of the line of symmetry
Whatdoes the standard deviation give us in a normally distributed set of results?
Describes how much the data is spread out
What does the area under a normal destruction bell curve show?
The percentage of data
Talk through the empire rule
You can approbate the area under a normal curve:
- 68% of data lies between the mean and 1 SD
- 95% of datat lies between mean and 2 SD
- 99.7% of data lies between means and 3 SD
Define population in statistics
It is a group of ALL items of interest
Define sample in regards to statistics
It is a set of data drawn from the population
What is a parameter?
A descriptive measure of a population
What is a statistic?
A descriptive measure of a sample
What is descriptive statistics?
It describes the data set bu doesn’t allow us to draw any conclusions or make any interferences about the data
What is inferential statistics?
When you draw conclusion of inferences about characteristics of populations based on data from a sample
How do we measure sampling variance?
Standard error
What is the relationship between sampling variation and sample size
The bigger the sample size the less sampling variation will occur
