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QUANTITATIVE RESEARC H
TECHNIQUES + STATISTICS -
PEREGRINE QUESTIONS AND
CORRECT DETAILED ANS WERS
WITH RATIONALES (VERIFIED
ANSWERS) |ALREADY GR ADED A+
Question : 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
Question : Significance level
Correct answer: Measures the reliability of a statistical
inference
Question : inferential statistics
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Correct answer: Process of using sample statistics
(mathematics) to draw conclusions about population parameters
Question : mutually exclusive
Correct answer: Events that cannot occur at the same
time.
Question : sampling error
Correct answer: the difference between the results of
random samples taken at the same time
Question : 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
Question : Design of a good survey components
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Correct answer: short survey, short/simple questions, start
with demographic questions, ues dichtomous (yes-no) and multiple choice
Question : Direct observation
Correct answer: example: counts backpacks on campus for a day
Question : 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.
Question : Joint Probability
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Correct answer: the probability of the intersection of two
events
Question : 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
Question : Marginal Probability
Correct answer: the probability of a single event without
consideration of any other event
Question : Conditional Probability
Correct answer: the likelihood that a target behavior will
occur in a given circumstance