QTM 100-MIDTERM 1QUESTIONS AND ANSWERS
Population of Interest - Answers - all people
sample - Answers - a subset of the population
Population - Answers - set of all subjects of interest
Sample - Answers - the subset of the population of interest on which you collect the
data
Census - Answers - everyone and "sample" in the entire population
Non - Answers - response- If only a small fraction of the randomly sample people
choose to respond to a survey, the sample may no longer be representative of the
population
Voluntary Response - Answers - occurs when the sample consists of people who
volunteer to respond because they have a strong opinion on the issue. Such a sample
will also not be representative of the population.
Convenience Sample - Answers - Choosing individuals who are easily accessible are
more likely to be included in the sample
Associated variable - Answers - when two variables show some connections with one
another
Dependent variables - Answers - associated variables
Independent variables - Answers - when two variables are not associated/ no evident
connection between the two
Most common used random sampling techniques - Answers - simple, stratified, and
cluster sampling.
Clusters - Answers - simple random sampling of clusters, and then sample all
observations in that cluster; usually not made up of homogeneous observations
Strata - Answers - a simple random sample from each stratum
Principles of Experimental Design - Answers - 1. Control 2. Randomize 3. Replicate 4.
Block
What is the goal of experimental designs? - Answers - find the cause and effect
relationship
Population of Interest - Answers - all people
sample - Answers - a subset of the population
Population - Answers - set of all subjects of interest
Sample - Answers - the subset of the population of interest on which you collect the
data
Census - Answers - everyone and "sample" in the entire population
Non - Answers - response- If only a small fraction of the randomly sample people
choose to respond to a survey, the sample may no longer be representative of the
population
Voluntary Response - Answers - occurs when the sample consists of people who
volunteer to respond because they have a strong opinion on the issue. Such a sample
will also not be representative of the population.
Convenience Sample - Answers - Choosing individuals who are easily accessible are
more likely to be included in the sample
Associated variable - Answers - when two variables show some connections with one
another
Dependent variables - Answers - associated variables
Independent variables - Answers - when two variables are not associated/ no evident
connection between the two
Most common used random sampling techniques - Answers - simple, stratified, and
cluster sampling.
Clusters - Answers - simple random sampling of clusters, and then sample all
observations in that cluster; usually not made up of homogeneous observations
Strata - Answers - a simple random sample from each stratum
Principles of Experimental Design - Answers - 1. Control 2. Randomize 3. Replicate 4.
Block
What is the goal of experimental designs? - Answers - find the cause and effect
relationship
