SMPA 6242 TEST QUESTIONS AND ANSWERS
group the big 5 summary stats - ANSWER mean, median, and mode
standard deviation and variance
when might the mean be more appropriate than the median & vice versa? -
ANSWER it might be more appropriate to use the median when you have
severely skewed distributions
using the mean can be more appropriate when our distribution is more
symmetric
can you provide some intuition as to why we square things when computing the
variance? - ANSWER because we want to count positive misses and negative
misses as equally bad, and misses further from the mean at an increasing
penalty rate
which of the big 5 is most important? - ANSWER none, it depends on the
research question at hand. they are better understood as part of a dashboard
together, instead of singularly better or worse than another
what is a difference between covariance and correlation? what is a similarity? -
ANSWER covariance and correlation both describe the relatedness of two
variables. if covariance tells us there is a positive relationship, so too will
correlation. they have different values, however.
what is the range of values for covariance? what about for correlation? -
ANSWER covariance is not restricted by a range. correlation is bounded by -1
and 1, inclusive.
how can a scatterplot help us visualize relationships? - ANSWER we can
literally see if things "move together" or not, which gives us and idea of their
relatedness.
group the big 5 summary stats - ANSWER mean, median, and mode
standard deviation and variance
when might the mean be more appropriate than the median & vice versa? -
ANSWER it might be more appropriate to use the median when you have
severely skewed distributions
using the mean can be more appropriate when our distribution is more
symmetric
can you provide some intuition as to why we square things when computing the
variance? - ANSWER because we want to count positive misses and negative
misses as equally bad, and misses further from the mean at an increasing
penalty rate
which of the big 5 is most important? - ANSWER none, it depends on the
research question at hand. they are better understood as part of a dashboard
together, instead of singularly better or worse than another
what is a difference between covariance and correlation? what is a similarity? -
ANSWER covariance and correlation both describe the relatedness of two
variables. if covariance tells us there is a positive relationship, so too will
correlation. they have different values, however.
what is the range of values for covariance? what about for correlation? -
ANSWER covariance is not restricted by a range. correlation is bounded by -1
and 1, inclusive.
how can a scatterplot help us visualize relationships? - ANSWER we can
literally see if things "move together" or not, which gives us and idea of their
relatedness.
