Exam (elaborations)
STA 270 EXAM 2 QUESTIONS AND ANSWERS
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STA 270 EXAM 2 QUESTIONS AND ANSWERS...
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What is statistical inference - ANSWER -Is the process of concluding theentire population based on information in a sample
What is a parameter? - ANSWER -Is a number that describes some
aspect of a population
What is a statistic? - ANSWER -Is a number that is computed from data
in a sample
T/F, We usually have a sample statistic and want to use it to make
inferences about the population parameter. - ANSWER -True
What is a point estimate? - ANSWER -we use the statistics from a
sample as a point estimate for a population parameter
T/F, A point estimate will not match population parameters exactly, but
they are our best guess, given the data? - ANSWER -True
T/F, Sample statistics vary from sample to sample? - ANSWER -True,
they will not match the parameter exactly
For a given sample statistic, what are plausible values for the population
parameter? How much uncertainty surrounds the sample statistic? -
ANSWER -It depends on how much the statistic varies from sample to
sample
What is sampling distribution? - ANSWER -Is the distribution of sample
statistics computed for different samples of the sample size from the
same population
T/F, A sampling distribution shows us how the sample statistic varies
from sample to sample? - ANSWER -True
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