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Quantitative Research Techniques + Statistics – Peregrine| 69 questions| with complete solutions
Question 1: 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 2: Significance level
CORRECT ANSWER : Measures the reliability of a statistical
inference
Question 3: inferential statistics
CORRECT ANSWER : Process of using sample statistics
(mathematics) to draw conclusions about population parameters
Question 4: mutually exclusive
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CORRECT ANSWER : Events that cannot occur at the same
time.
Question 5: sampling error
CORRECT ANSWER : the difference between the results of
random samples taken at the same time
Question 6: 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 7: Design of a good survey components
CORRECT ANSWER : short survey, short/simple questions,
start with demographic questions, use dichotomous (yes-no) and multiple choice
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Question 8: Direct observation
CORRECT ANSWER : example: counts backpacks on campus for a day
Question 9: 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 10: Joint Probability
CORRECT ANSWER : the probability of the intersection of two
events
Question 11: Union of two events
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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 12: Marginal Probability
CORRECT ANSWER : the probability of a single event without
consideration of any other event
Question 13: Conditional Probability
CORRECT ANSWER : the likelihood that a target behavior will
occur in a given circumstance