Pub Aff 60 Midterm Lecture notes
questions with best solutions
Name two alternate names for the term observations? - answersrecords or cases
Data - answersan observation (case) per unit observed
what is a unit of observation - answersthe source of the data (i.e., people, high schools,
etc.)
what is a record/case/observation within a dataset - answersit is one row of the dataset
true or false: a variable can not be constant - answersfalse
variable - answersa characteristic of an observation
what does merging entail within a dataset - answersadding a new variable (aka a
column)
what does append mean in terms of a dataset - answersit is to add more observations
(aka rows)
True or False: categorical variables are all discrete? - answersTRUE
What type of variable do both nominal and ordinal variables classify as? -
answerscategorical
How does a nominal variable differ from an ordinal variable? - answersA nominal
variable will have categories that are not able to be ordered, unlike an ordinal variable
What type of variable do both interval and ratio variables classify under? -
answersContinuous/continuous-ish if discrete
Is a dummy variable categorical or continuous? - answerscategorical
If numerical variable is discrete, what is the status of its continuity - answersit would be
continuous-ish
what type of graphs are appropriate for categorical data - answersbar graphs (relative
frequency) and pie charts
questions with best solutions
Name two alternate names for the term observations? - answersrecords or cases
Data - answersan observation (case) per unit observed
what is a unit of observation - answersthe source of the data (i.e., people, high schools,
etc.)
what is a record/case/observation within a dataset - answersit is one row of the dataset
true or false: a variable can not be constant - answersfalse
variable - answersa characteristic of an observation
what does merging entail within a dataset - answersadding a new variable (aka a
column)
what does append mean in terms of a dataset - answersit is to add more observations
(aka rows)
True or False: categorical variables are all discrete? - answersTRUE
What type of variable do both nominal and ordinal variables classify as? -
answerscategorical
How does a nominal variable differ from an ordinal variable? - answersA nominal
variable will have categories that are not able to be ordered, unlike an ordinal variable
What type of variable do both interval and ratio variables classify under? -
answersContinuous/continuous-ish if discrete
Is a dummy variable categorical or continuous? - answerscategorical
If numerical variable is discrete, what is the status of its continuity - answersit would be
continuous-ish
what type of graphs are appropriate for categorical data - answersbar graphs (relative
frequency) and pie charts
