Quantitative Research Techniques +
Statistics – Peregrine.
A company developed a smartphone whose average lifetime is unknown. In
order to estimate the average, 200 smartphones are randomly selected from a
large production line and tested; their average is found to be 5 years. The 200
smartphones represent: ~CORRECT ANSWER~✓✓a sample
Significance level ~CORRECT ANSWER~✓✓Measures the reliability of a
statistical inference
inferential statistics ~CORRECT ANSWER~✓✓Process of using sample
statistics (mathematics) to draw conclusions about population parameters
mutually exclusive ~CORRECT ANSWER~✓✓Events that cannot occur at
the same time.
sampling error ~CORRECT ANSWER~✓✓the difference between the results
of random samples taken at the same time
non-sampling error ~CORRECT ANSWER~✓✓occurs when the sample data
are incorrectly collected, recorded, or analyzed. Three types of errors: data
acquisition errors, non-response errors (or bias), selection bias
Design of a good survey components ~CORRECT ANSWER~✓✓short survey,
short/simple questions, start with demographic questions, ues dichtomous
(yes-no) and multiple choice
, Direct observation ~CORRECT ANSWER~✓✓example: counts backpacks on
campus for a day
stratified random sample ~CORRECT ANSWER~✓✓a sample from selected
subgroups of the target population in which everyone in those subgroups has
an equal chance of being included in the research
example: The manager of a customer service division wants to know if the
customers in the past 12 months are satisfied with their purchase of CD's.
There are four types of CD's.
Joint Probability ~CORRECT ANSWER~✓✓the probability of the
intersection of two events
Union of two events ~CORRECT ANSWER~✓✓The union of events A and B
is the event containing all sample points that are in A or B or both
Marginal Probability ~CORRECT ANSWER~✓✓the probability of a single
event without consideration of any other event
Conditional Probability ~CORRECT ANSWER~✓✓the likelihood that a
target behavior will occur in a given circumstance
Bayes Law ~CORRECT ANSWER~✓✓calculates posterior probability
Statistics – Peregrine.
A company developed a smartphone whose average lifetime is unknown. In
order to estimate the average, 200 smartphones are randomly selected from a
large production line and tested; their average is found to be 5 years. The 200
smartphones represent: ~CORRECT ANSWER~✓✓a sample
Significance level ~CORRECT ANSWER~✓✓Measures the reliability of a
statistical inference
inferential statistics ~CORRECT ANSWER~✓✓Process of using sample
statistics (mathematics) to draw conclusions about population parameters
mutually exclusive ~CORRECT ANSWER~✓✓Events that cannot occur at
the same time.
sampling error ~CORRECT ANSWER~✓✓the difference between the results
of random samples taken at the same time
non-sampling error ~CORRECT ANSWER~✓✓occurs when the sample data
are incorrectly collected, recorded, or analyzed. Three types of errors: data
acquisition errors, non-response errors (or bias), selection bias
Design of a good survey components ~CORRECT ANSWER~✓✓short survey,
short/simple questions, start with demographic questions, ues dichtomous
(yes-no) and multiple choice
, Direct observation ~CORRECT ANSWER~✓✓example: counts backpacks on
campus for a day
stratified random sample ~CORRECT ANSWER~✓✓a sample from selected
subgroups of the target population in which everyone in those subgroups has
an equal chance of being included in the research
example: The manager of a customer service division wants to know if the
customers in the past 12 months are satisfied with their purchase of CD's.
There are four types of CD's.
Joint Probability ~CORRECT ANSWER~✓✓the probability of the
intersection of two events
Union of two events ~CORRECT ANSWER~✓✓The union of events A and B
is the event containing all sample points that are in A or B or both
Marginal Probability ~CORRECT ANSWER~✓✓the probability of a single
event without consideration of any other event
Conditional Probability ~CORRECT ANSWER~✓✓the likelihood that a
target behavior will occur in a given circumstance
Bayes Law ~CORRECT ANSWER~✓✓calculates posterior probability
