R Programming Questions and Answers – Visualizing Data – 1


This set of R Programming Language Multiple Choice Questions & Answers (MCQs) focuses on “Visualizing Data – 1”.

1. Which of the following method make vector of repeated values?
a) rep()
b) data()
c) view()
d) read()
View Answer

Answer: b
Explanation: data() load (often into a data.frame) built-in dataset.


2. Which of the following finds the position of a quantile in a dataset?
a) quantile()
b) barplot()
c) barchart()
d) rep()
View Answer

Answer: a
Explanation: barplot() produces a bar graph.

3. Which of the following function cross-tabulate tables using formulas?
a) table
b) stem
c) xtabs
d) read
View Answer

Answer: d
Explanation: table() list all values of a variable with frequencies.

4. Which of the following groups find the correlation matrix?
a) factor.model
b) col.max(x)
c) stem
d) which.max(x)
View Answer

Answer: a
Explanation: factor.congruence is used to find the factor congruence coefficients.

5. which of the following statement make a mosaic plot?
a) histogram()
b) mosaicplot()
c) bar()
d) which.max(x)
View Answer

Answer: b
Explanation: histogram() is lattice command for producing a histogram.


6. Which of the following compute proportions from a contingency table?
a) par()
b) prop.table()
c) anova()
d) mosaicplot()
View Answer

Answer: b
Explanation: par() is used to query and edit graphical settings.

7. Which of the following is lattice command for producing a scatterplot?
a) plot()
b) lm()
c) xyplot()
d) anova()
View Answer

Answer: c
Explanation: plot() produces a scatterplot.

8. Which of the following builds empirical cumulative distribution function?
a) ecdf()
b) cum
c) cumsum
d) lm()
View Answer

Answer: a
Explanation: cumsum() is used to produce running total of values for input vector.

9. Which of the following is used to view dataset in a spreadsheet-type format ?
a) Disp()
b) View()
c) Seq()
d) lm()
View Answer

Answer: b
Explanation: seq() make arithmetic progression vector.


10. ________ function carries out a chi-square test.
a) chisq.test()
b) t.test()
c) prop.test()
d) fisher.test()
View Answer

Answer: a
Explanation: prop.test() is used to inference for 1 proportion using normal approx.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn