IDS 270 VOCAB Questions with Verified
Correct Answers
We observe the behavior or ask people questions as they are going about their day to
day lives. Ex: Call people and ask them how often they eat out.
Observational Study
We impose some treatment on people and then observe their behavior or ask questions.
Ex: Give people a drug and then do chemical analysis of their blood.
Experiment
Two variables where the effect of one on the dependent variable cannot be separated
from the effect of the other. Ex: If you take drugs and drink alcohol and the have a car
accident, the effect of the drugs vs. the alcohol cannot be separated from each other as
the cause of the accident
Confounded Variables
The set of everything. Ex: All the people in America
Population
A small group pulled from the population. Ex: Sample 40 voters from the population of
America
Sample
People volunteer to give data for a study. Ex: people text to a phone number if they
agree with a statement and text to a different one if they disagree.
Voluntary response sampling
, People are selected to be in a sample because of convenience or low expense. Ex: Mall
intercepts, or asking the people on the floor of your dorm to fill out a survey.
Convenience sampling
Systematically favoring a certain outcome from research.
Bias (1)
Label all the people in the population with a number. Have a computer select a set of
random numbers in that range. People labeled with the number are selected for the
sample. Therefore every person or sub-group of people has an equal chance of being in
the sample.
Simple Random Sampling
First breaking the population into natural segments (Called strata) and then using
random sampling within the strata. Ex: Radio stations or types of colleges (community
colleges, public universities, private universities, stand-alone liberal arts colleges)
Stratified Sampling
Basically practicing stratified sampling repeatedly to get to a final sample.
Multi-stage sampling
Where some members of the population cannot be selected for the sample. Ex: People
without phones if one is collecting data over the phone.
Undercoverage
When an individual selected for the sample does not provide information
Non Response
Correct Answers
We observe the behavior or ask people questions as they are going about their day to
day lives. Ex: Call people and ask them how often they eat out.
Observational Study
We impose some treatment on people and then observe their behavior or ask questions.
Ex: Give people a drug and then do chemical analysis of their blood.
Experiment
Two variables where the effect of one on the dependent variable cannot be separated
from the effect of the other. Ex: If you take drugs and drink alcohol and the have a car
accident, the effect of the drugs vs. the alcohol cannot be separated from each other as
the cause of the accident
Confounded Variables
The set of everything. Ex: All the people in America
Population
A small group pulled from the population. Ex: Sample 40 voters from the population of
America
Sample
People volunteer to give data for a study. Ex: people text to a phone number if they
agree with a statement and text to a different one if they disagree.
Voluntary response sampling
, People are selected to be in a sample because of convenience or low expense. Ex: Mall
intercepts, or asking the people on the floor of your dorm to fill out a survey.
Convenience sampling
Systematically favoring a certain outcome from research.
Bias (1)
Label all the people in the population with a number. Have a computer select a set of
random numbers in that range. People labeled with the number are selected for the
sample. Therefore every person or sub-group of people has an equal chance of being in
the sample.
Simple Random Sampling
First breaking the population into natural segments (Called strata) and then using
random sampling within the strata. Ex: Radio stations or types of colleges (community
colleges, public universities, private universities, stand-alone liberal arts colleges)
Stratified Sampling
Basically practicing stratified sampling repeatedly to get to a final sample.
Multi-stage sampling
Where some members of the population cannot be selected for the sample. Ex: People
without phones if one is collecting data over the phone.
Undercoverage
When an individual selected for the sample does not provide information
Non Response
