Explain How Basic R Commands Are Used to Initially Explore and Analyze the Data DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   Which R function creates a histogram to visualize the distribution of a numeric variable?

   • Aboxplot()
   • Bsummary()
   • Cplot()
   • Dhist()
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   Which R function is specifically designed to subset a data frame based on a logical condition?

   • Asubset()
   • Bsummary()
   • Chead()
   • Dstr()
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   Which R function provides a compact display of the internal structure of an R object, including the data types of each column?

   • Ahead()
   • Bstr()
   • Csummary()
   • DView()
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A data file `data.txt` uses semicolons as separators and does not have a header row. An analyst wants to load it into R as a data frame. Which R command is appropriate?

   • Aread.csv('data.txt', sep = ';', header = FALSE)
   • Bread.delim('data.txt', sep = ';', header = FALSE)
   • Cread.table('data.txt', sep = ';', header = FALSE)
   • Dread.csv2('data.txt', header = FALSE)
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   Which R function is most commonly used to create a scatterplot of two numeric variables?

   • Asummary()
   • Bboxplot()
   • Cplot()
   • Dhist()
   Reveal Solution Discussion Select an answer first