R Programming Questions and Answers – Visualizing Data – 2

This set of R Programming Language Multiple Choice Questions & Answers (MCQs) focuses on “Visualizing Data – 2”.

1. Which of the following adds marginal sums to an existing table?
a) par()
b) prop.table()
c) addmargins()
d) quantile()
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2. Which of the following lists names of variables in a data.frame?
a) quantile()
b) names()
c) barchart()
d) par()
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3. Which of the following is tool for chi-square distributions?
a) pchisq()
b) chisq()
c) pnorm
d) barchart()
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4. Which of the following groups values of a variable into larger bins?
a) cut
b) col.max(x)
c) stem
d) which.max(x)
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5. Which of the following determine the least-squares regression line?
a) histo()
b) lm
c) barlm()
d) col.max(x)
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6. Which of the following is tool for checking normality?
a) qqline()
b) qline()
c) anova()
d) lm()
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7. Which of the following is lattice command for producing boxplots?
a) plot()
b) bwplot()
c) xyplot()
d) barlm()
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8. Which of the following compute analysis of variance table for fitted model?
a) ecdf()
b) cum()
c) anova()
d) bwplot()
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9. Which of the following is used to find variance of all values?
a) var()
b) sd()
c) mean()
d) anova()
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10.The purpose of fisher.test() is _______ test for contingency table.
a) Chisq
b) Fisher
c) Prop
d) Stem
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