CNSL 503: A GUIDE TO A+. QUESTIONS AND ANSWERS
FORMAT.LATEST UPDATE
parameter
a numerical value that describes a population
example of parameter
population mean
statistic
a value that describes a sample; used to estimate population parameter
example of a statistics
sample mean
In order to make correct inferences about the population, the sample must...
reflect the population
representative sample
consist of members that possess the same characteristics as those of the population
biased sample
a sample that is not representative of the population
5 types of sampling techniques
simple random sampling, systematic sampling, stratified sampling, cluster sampling, and convenience
sampling
simple random sampling
each member of the population has an equal chance of being selected for the sample
example of simple random sampling
everyone in the population of interest rolls a die, everyone rolling a 6 gets selected
In simple random sampling, the probability that each member is selected is ____ of one another.
independent
Simple random sampling is ideal for ____ populations.
small
systemic sampling
, random sampling with a system in which a starting point is random and each subsequent member is
selected based on a fixed interval
example of systemic sampling
shoppers at a store, start with second person entering and survey every 5 shoppers
In systemic sampling, the probability that each member is selected is ____of one another.
dependent
Systematic sampling is more ____ that simple random sampling.
efficient
What kind of problem can arise in systematic sampling?
someone finds out and avoids being the 5th person
stratified sampling
dividing the population into strata and randomly sampling from each stratum
example of stratified sampling
dividing population into age groups and randomly sampling from each stratum
Stratified sampling can be hard with...
large populations
cluster sampling
dividing the population into clusters and randomly sampling several clusters, then study every member
within the cluster
example of cluster sampling
nursing students taking stats, randomly sample number of counties and sampling students in those
counties
convenience sampling
selecting a sample that is convenient and easy to access
example of convenience sampling
left handers at school, go into a large lecture hall and everyone left handed raises hand
Does convenience sampling result in a representative sample?
no
Convenience sampling is generally more prone to ____ than other sampling.
bias
FORMAT.LATEST UPDATE
parameter
a numerical value that describes a population
example of parameter
population mean
statistic
a value that describes a sample; used to estimate population parameter
example of a statistics
sample mean
In order to make correct inferences about the population, the sample must...
reflect the population
representative sample
consist of members that possess the same characteristics as those of the population
biased sample
a sample that is not representative of the population
5 types of sampling techniques
simple random sampling, systematic sampling, stratified sampling, cluster sampling, and convenience
sampling
simple random sampling
each member of the population has an equal chance of being selected for the sample
example of simple random sampling
everyone in the population of interest rolls a die, everyone rolling a 6 gets selected
In simple random sampling, the probability that each member is selected is ____ of one another.
independent
Simple random sampling is ideal for ____ populations.
small
systemic sampling
, random sampling with a system in which a starting point is random and each subsequent member is
selected based on a fixed interval
example of systemic sampling
shoppers at a store, start with second person entering and survey every 5 shoppers
In systemic sampling, the probability that each member is selected is ____of one another.
dependent
Systematic sampling is more ____ that simple random sampling.
efficient
What kind of problem can arise in systematic sampling?
someone finds out and avoids being the 5th person
stratified sampling
dividing the population into strata and randomly sampling from each stratum
example of stratified sampling
dividing population into age groups and randomly sampling from each stratum
Stratified sampling can be hard with...
large populations
cluster sampling
dividing the population into clusters and randomly sampling several clusters, then study every member
within the cluster
example of cluster sampling
nursing students taking stats, randomly sample number of counties and sampling students in those
counties
convenience sampling
selecting a sample that is convenient and easy to access
example of convenience sampling
left handers at school, go into a large lecture hall and everyone left handed raises hand
Does convenience sampling result in a representative sample?
no
Convenience sampling is generally more prone to ____ than other sampling.
bias
