Chapter 1-3 defination quiz

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21 Terms

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Statstics

Describes a sample

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parameter

Describes a population

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Population standard deviation

Data of the entire group your studying

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Example of Population standard deviation

You measured the height of every single student at school

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Sample standard deviation

Working with a portion ( subset) of the population

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Example of sample standard deviation

You collect height data of 30 students out of 500

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Discrete Variable

It’s countable and your can liste all the possible values

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Example of discrete variable

Number of books on shelf

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continuos variable

Can take any value, even decimals and fractions

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Continuous variable example

Height of a person ( 160.2cm )

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Stratified random sampling

Dividing the population into groups or strata based on characteristics

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Stratified random sampling example

Splitting people into groups based on age like 0-18 , 19-40

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Cluster sampling

Dividing the groups that already exist into cluster and then select individual clusters

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Example of Cluster Sampling

Study 5 students from 5 schools out of 20 schools

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Systematic sampling

You select every key number of the population list, starting off with a random starting point that isn’t the kth number

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Voluntary response sample

People choose themselves by responding

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Example of voluntary responses sampling

Person choosing to answer a poll asking, “ Do you support the new policy”?

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Example of Systematic Sampling

picking every 10th name of a student roster of 100 and starting off with random number of. 4

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Randomized experiment useful in

A company developing a new formula for dog food and wanting to determine if the food helps dog loss weight

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Convenience Example

New reporter asking shoppers their opinion

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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