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STA 1200 Chapter 1 Exam Questions and Complete Solutions Graded A+.
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STA 1200 Chapter 1Exam Questions and
Complete Solutions
Graded A+
Statistics - Answer: the study of procedures for collecting, describing, and drawing conclusions from
information
Population - Answer: entire collection of elements about which information is sought and whose
characteristics are being studied
Elements - Answer: individuals, items, and objects where information is collected from
Based on the sample - Answer: What are statistics based on?
Sample - Answer: subset of a population, containing the elements that are actually observed for study
No - Answer: Do all samples represent the population well?
Representative (unbiased) sample - Answer: A sample that is similar to the target population and
represents the characteristics of the population as close as possible
Simple random sample
Convenience sample
Stratified random sample
Cluster random sample
, Systematic random sample - Answer: How do we collect unbiased or representative samples?
Simple Random Sample - Answer: A sample chosen by a method in which each collection of n elements
from the population (population size N) is equally likely to make up the sample
Convenience Sample - Answer: A sample that is not drawn by a well defined method and may be more
prone to bias due to a possible systematic difference from the population
If there is reason to believe that there is no important systematic difference between the sample and
the population - Answer: When is it acceptable for a convenience sample?
If there exists a possible systematic difference between the sample and the population - Answer: When
is it unacceptable for a convenience sample?
Stratified Random Sample - Answer: A sample taken from divided groups from the population where an
SRS is drawn from each group
when the group differs from one another but the individuals within the group tend to be alike - Answer:
When is a Stratified Random Sample useful?
Cluster Random Sample - Answer: A sample taken from divided groups from the population where an
SRS is drawn for some groups
Strata - Answer: the name of the groups that the population divided into for stratified random sample
Cluster - Answer: The name of the groups that the population divided into for cluster random sample
Systematic Random Sample - Answer: A sample where we randomly select one element as a starting
place and then every kth element thereafter is chosen to be included in the sample
used to sample products as they come off an assembly line in mass production facilities to check that
they meet quality standards (quality control) - Answer: When is Systematic Random Sample used?
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