Explain How Basic R Commands Are Used to Initially Explore and Analyze the Data DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 5)

Questions 21–24

1. 21foundation · easy

   Which R function returns the middle value of a sorted numeric vector?

   • Amean()
   • Bmedian()
   • Cmin()
   • Dmax()
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   Which R function is most appropriate to read a comma-separated values (CSV) file into a data frame?

   • Ascan()
   • Bread.csv()
   • CreadLines()
   • Dread.table()
   Reveal Solution Discussion Select an answer first
4. 23application · easy

   A data frame `results` has a numeric column `score`. An analyst wants to obtain the minimum, first quartile, median, mean, third quartile, and maximum in a single output. Which R command provides all of these?

   • Arange(results$score)
   • Bsummary(results$score)
   • Cfivenum(results$score)
   • Ddescribe(results$score)
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A data frame `groups` has a numeric column `value` and a categorical column `category` with levels 'A', 'B', and 'C'. An analyst wants to compare the distribution of `value` across the three categories. Which R command is most appropriate?

   • Aboxplot(value ~ category, data = groups)
   • Bplot(groups$value, groups$category)
   • Chist(groups$value)
   • Dsummary(groups$value)
   Reveal Solution Discussion Select an answer first