QUANTITATIVE RESEARCH TECHNIQUES
+ STATISTICS – PEREGRINE| 69 EXAM
QUESTIONS AND SOLUTIONS.
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
+ STATISTICS – PEREGRINE| 69 EXAM
QUESTIONS AND SOLUTIONS.
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
