Quantitative Research Techniques + Statistics – Peregrine| 69
questions| with complete solutions 2025 Graded A+ Pass.
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: - ANSWERS-a sample
Significance level - ANSWERS-Measures the reliability of a statistical inference
inferential statistics - ANSWERS-Process of using sample statistics (mathematics)
to draw conclusions about population parameters
mutually exclusive - ANSWERS-Events that cannot occur at the same time.
sampling error - ANSWERS-the difference between the results of random samples
taken at the same time
non-sampling error - ANSWERS-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 - ANSWERS-short survey, short/simple
questions, start with demographic questions, ues dichtomous (yes-no) and
multiple choice
Direct observation - ANSWERS-example: counts backpacks on campus for a day
stratified random sample - ANSWERS-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.
