Unit 4 Flashcards
(12 cards)
What are the three types of samples?
Convenience sampling, Random Sampling, and Voluntary response sampling
Define a stratified sample:
The population is first split into groups. The overall sample consists of some members from every group. The members from each group are chosen randomly.
A population is split into homogeneous groups. From each group, a random sample is selected
Homogeneous groups
Define cluster sample
A population is split into heterogeneous groups. Then, a random sample is taken from each group
Hetero groups
What is a non-response rate?
When is it used?
Non-response occurs in a sample when an individual who has been chosen for a sample can not be contacted or refused to participate
used in sampling
What is response bias?
When is it used?
Response bias is when a individual gives an un-honest response
What is under-coverage?
when is it used?
Undercoverage is when a sample does not represent the whole population
this is used in a sample
what are the four types of random sampling?
SRS, Stratified, Clustered, Systematic,
Do experiments have a bias?
no, they have confounding variables
What responses lead to bias?
voluntary response, convenience response, under coverage, non-response, and response bias
what are the types of sampling errors
Voluntary response and convenience sample
What is sampling variability
The variation in statistical information from a sample when random sampling is repeated.
Sampling variability decreases as sample size increases.
They do not result in perfect estimates for a value in a population
what is statistical significance?
how likely it is that the results of your experiment are due to the effect or the relationship, rather than random chance
