MGSC 291 exam 1 questions with 100%
correct answers
What is a factor in R - correct answer ✔✔R's way of storing something as a categorical variable
What does ! mean in R - correct answer ✔✔Not/ opposite
What does the which function do in R - correct answer ✔✔returns the position within the vector
What does the summary(numeric) tell you - correct answer ✔✔5 number summary and mean
What does summary(categorical) tell you - correct answer ✔✔Count of each unique level
what does strings=T give you - correct answer ✔✔Character data read as a factor
Short for stringsAsFactors = TRUE
What does it mean if you get a + instead of < - correct answer ✔✔you haven't closed out a parenthesis,
quote, bracket, etc.
What are descriptive statistics - correct answer ✔✔collecting, organizing, and presenting data
What are inferential statistics - correct answer ✔✔drawing conclusions about a population based on
sample data from population
what is a parameter - correct answer ✔✔number used to describe a population
, What is a statistic - correct answer ✔✔number calculated from sample and is used to estimate
parameter
What is an observational unit - correct answer ✔✔smallest unit upon which observation is made
What is cross sectional data - correct answer ✔✔variable that is measured at the same point for multiple
observational units
What is a time series - correct answer ✔✔variable that is measured at regular intervals over time for a
single observational unit
What is a longitudal survey - correct answer ✔✔survey where you ask a set of customers the same
questions at a regular interval to see how opinions change over time
what is a data lake and who would use it - correct answer ✔✔stores structured, semi structured, and
unstructured data. Has not been prepared for any purpose
Used by scientist or data architect
What is a data warehouse and who would use it - correct answer ✔✔stores structured data ready for
analytics
Used by a business professional
What does it mean if mean> median - correct answer ✔✔data is skewed right
Boxplot
-does it display quantitative or qualitative data
-how large of datasets can you see
-what does it plot
-what is it good for - correct answer ✔✔-quantitative data
correct answers
What is a factor in R - correct answer ✔✔R's way of storing something as a categorical variable
What does ! mean in R - correct answer ✔✔Not/ opposite
What does the which function do in R - correct answer ✔✔returns the position within the vector
What does the summary(numeric) tell you - correct answer ✔✔5 number summary and mean
What does summary(categorical) tell you - correct answer ✔✔Count of each unique level
what does strings=T give you - correct answer ✔✔Character data read as a factor
Short for stringsAsFactors = TRUE
What does it mean if you get a + instead of < - correct answer ✔✔you haven't closed out a parenthesis,
quote, bracket, etc.
What are descriptive statistics - correct answer ✔✔collecting, organizing, and presenting data
What are inferential statistics - correct answer ✔✔drawing conclusions about a population based on
sample data from population
what is a parameter - correct answer ✔✔number used to describe a population
, What is a statistic - correct answer ✔✔number calculated from sample and is used to estimate
parameter
What is an observational unit - correct answer ✔✔smallest unit upon which observation is made
What is cross sectional data - correct answer ✔✔variable that is measured at the same point for multiple
observational units
What is a time series - correct answer ✔✔variable that is measured at regular intervals over time for a
single observational unit
What is a longitudal survey - correct answer ✔✔survey where you ask a set of customers the same
questions at a regular interval to see how opinions change over time
what is a data lake and who would use it - correct answer ✔✔stores structured, semi structured, and
unstructured data. Has not been prepared for any purpose
Used by scientist or data architect
What is a data warehouse and who would use it - correct answer ✔✔stores structured data ready for
analytics
Used by a business professional
What does it mean if mean> median - correct answer ✔✔data is skewed right
Boxplot
-does it display quantitative or qualitative data
-how large of datasets can you see
-what does it plot
-what is it good for - correct answer ✔✔-quantitative data
