- | Page
STATISTICS PORTAGE C NSL 503
EXAM 3 QUESTIONS AND
ANSWERS LATEST UPDAT E
Question 1: a numerical value that describes a population
CORRECT ANSWER: parameter
Question 2: example of parameter
CORRECT ANSWER: population mean
Question 3: a value that describes a sample; used to
estimate population parameter
CORRECT ANSWER: statistic
Question 4: example of a statistics
CORRECT ANSWER: sample mean
Question 5: In order to make correct inferences about the
population, the sample must...
CORRECT ANSWER: reflect the population
- | Page
Question 6: consist of members that possess the same
characteristics as those of the population
CORRECT ANSWER: representative sample
Question 7: a sample that is not representative of the
population
CORRECT ANSWER: biased sample
Question 8: 5 types of sampling techniques
CORRECT ANSWER: simple random sampling,
systematic sampling, stratified sampling, cluster sampling, and convenience sampling
Question 9: each member of the population has an equal
chance of being selected for the sample
CORRECT ANSWER: simple random sampling
Question 10: example of simple random sampling
- | Page
CORRECT ANSWER: everyone in the population of
interest rolls a die, everyone rolling a 6 gets selected
Question 11: In simple random sampling, the probability
that each member is selected is ____ of one another.
CORRECT ANSWER: independent
Question 12: Simple random sampling is ideal for ____
populations.
CORRECT ANSWER: small
Question 13: random sampling with a system in which a
starting point is random and each subsequent member is selected based on a fixed interval
CORRECT ANSWER: systemic sampling
Question 14: example of systemic sampling
CORRECT ANSWER: shoppers at a store, start with
second person entering and survey every 5 shoppers
- | Page
Question 15: In systemic sampling, the probability that
each member is selected is ____of one another.
CORRECT ANSWER: dependent
Question 16: Systematic sampling is more ____ that
simple random sampling.
CORRECT ANSWER: efficient
Question 17: What kind of problem can arise in
systematic sampling?
CORRECT ANSWER: someone finds out and avoids
being the 5th person
Question 18: dividing the population into strata and
randomly sampling from each stratum
CORRECT ANSWER: stratified sampling
Question 19: example of stratified sampling
CORRECT ANSWER: dividing population into age
groups and randomly sampling from each stratum