MGSC 291 Walters Final Exam questions
well answered graded A+
In the read.csv () function in R, what does "strings=T" mean? - correct answer ✔✔Non-Numerical data
should be considered categorical data
Which R function returns the frequency distribution for a categorical variable? - correct answer
✔✔Summary ()
In the mean () function in R, what does na.rm=T mean? - correct answer ✔✔Ignore any missing data
when computing the mean.
Which of the following functions tells R to consider the variable zip code as a categorical variable? -
correct answer ✔✔Factor ()
The range of the middle 50% of data is called the... - correct answer ✔✔IQR
The 50th percentile is called the - correct answer ✔✔Median
The typical deviation of observations from the mean is called the - correct answer ✔✔Standard
deviation
Which measure is best used to describe center when the distribution is symmetric with no outliers? -
correct answer ✔✔Mean
The operations team at CFA is testing a new kitchen design to improve efficiency. They think it's success
might differ between mall restaurants and free-standing restaurants l, so they decided to test in 10 mall
restaurants and 30 free-standing restaurants. Which sampling design should they use? - correct answer
✔✔Stratified random sample
well answered graded A+
In the read.csv () function in R, what does "strings=T" mean? - correct answer ✔✔Non-Numerical data
should be considered categorical data
Which R function returns the frequency distribution for a categorical variable? - correct answer
✔✔Summary ()
In the mean () function in R, what does na.rm=T mean? - correct answer ✔✔Ignore any missing data
when computing the mean.
Which of the following functions tells R to consider the variable zip code as a categorical variable? -
correct answer ✔✔Factor ()
The range of the middle 50% of data is called the... - correct answer ✔✔IQR
The 50th percentile is called the - correct answer ✔✔Median
The typical deviation of observations from the mean is called the - correct answer ✔✔Standard
deviation
Which measure is best used to describe center when the distribution is symmetric with no outliers? -
correct answer ✔✔Mean
The operations team at CFA is testing a new kitchen design to improve efficiency. They think it's success
might differ between mall restaurants and free-standing restaurants l, so they decided to test in 10 mall
restaurants and 30 free-standing restaurants. Which sampling design should they use? - correct answer
✔✔Stratified random sample
