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Statstics
Describes a sample
parameter
Describes a population
Population standard deviation
Data of the entire group your studying
Example of Population standard deviation
You measured the height of every single student at school
Sample standard deviation
Working with a portion ( subset) of the population
Example of sample standard deviation
You collect height data of 30 students out of 500
Discrete Variable
It’s countable and your can liste all the possible values
Example of discrete variable
Number of books on shelf
continuos variable
Can take any value, even decimals and fractions
Continuous variable example
Height of a person ( 160.2cm )
Stratified random sampling
Dividing the population into groups or strata based on characteristics
Stratified random sampling example
Splitting people into groups based on age like 0-18 , 19-40
Cluster sampling
Dividing the groups that already exist into cluster and then select individual clusters
Example of Cluster Sampling
Study 5 students from 5 schools out of 20 schools
Systematic sampling
You select every key number of the population list, starting off with a random starting point that isn’t the kth number
Voluntary response sample
People choose themselves by responding
Example of voluntary responses sampling
Person choosing to answer a poll asking, “ Do you support the new policy”?
Example of Systematic Sampling
picking every 10th name of a student roster of 100 and starting off with random number of. 4
Randomized experiment useful in
A company developing a new formula for dog food and wanting to determine if the food helps dog loss weight
Convenience Example
New reporter asking shoppers their opinion
Randomized Experiement
Participants are randomly assigned to different groups with different assigned study to test the effects of something
group 1 : Dog eats sample 1 formula
Group 2: dog eats sample 2 formula
Group 3: Dog eats current formula out in market