Exam (elaborations)
Descriptive Analysis(questions with complete solutions)
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Descriptive Analysis(questions with complete solutions)
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Descriptive AnalysisWhat is a descriptive analysis? - correct answer ✔✔The goal of descriptive analysis is to understand the
components of a data set, describe what they are, and explain that description to others who might
want to understand the data
What are the best practices for sampling from a population? - correct answer ✔✔●Always think about
what your population is
●Collect data from a sample that is representative of your population.
-If you have no choice but to work with a dataset that is not collected randomly and is biased, be careful
not to generalize your results to the entire population
How do we describe a dataset? What measurements do we use? (size, missingness, shape, central
tendency, variability) - correct answer ✔✔Size(number of rows and columns), missingness(where is data
missing), shape(It's critical to know the distribution of the variables in your dataset b/c certain statistical
approaches can only be used with certain distributions), central tendency, variation
What code would you use to generate descriptive statistics? - correct answer ✔✔
Statistics - correct answer ✔✔the science that deals with he collection, classification, analysis, and
interpretation of numerical facts or data, and that, by use of mathematical theories of probability,
imposes order and regularity on aggregates of more or less disparate elements. the science that deals
with the collection, classification, analysis, and interpretation of numerical facts or data, and that, by use
of mathematical theories of probability, imposes order and regularity on aggregates of more or less
disparate elements
Statistic - correct answer ✔✔a quantity computed from a sample
GIGO - correct answer ✔✔Garbage in. Garbage out. It's always worth spending time at the beginning of
a project to determine whether or not the data you have are garbage. be certain they are actually able to
help you answer the question you're interested in
, Shape:different types of distribution: - correct answer ✔✔distribution of values is constant over the
range of the variable, the possibility of getting any value is the same distribution if you rolled a die 1M
times
Shape:abell-shapeddistiribution - correct answer ✔✔most values are near the central value. data are
symmetric around middle
skewed distribution - correct answer ✔✔most values fall to one extreme within the range
bimodal distribution - correct answer ✔✔distribution with two distinct peaks
random distribution - correct answer ✔✔distribution has no apparent pattern
uniformly distributed example - correct answer ✔✔daily chance of winning the lottery
bimodal example: - correct answer ✔✔heights of a family with two parents and 10 children
distribution of speed limits in the US - correct answer ✔✔bimodal
distribution of number of siblings you all have: - correct answer ✔✔skewed to the right
distribution of heights of a family with two parents and 10 children - correct answer ✔✔heights tend to
be similar. heights of 1 -bimodal distribution
Distribution of heights of a random sample of adults in the US. like heights of females - correct answer
✔✔normal distribution
Distribution of daily chance of winning the lottery - correct answer ✔✔uniform distribution
Outliers can occur due to.... - correct answer ✔✔data entry errors, poor sampling procedures, technical
or mechanical error, unexpected changes in weather. indicate that you removed some outliers
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