Data Visualization With Ggplot2 - Study Mode

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[#91] Which of the following is one of the most important aspects of a good package?

(A) Title

(B) Description

(C) Documentation

(D) Libraries

Correct Answer

(C) Documentation

[#92] Which of the following code will drop the nth column?

(A) new <- old[-n,]

(B) new <- old[,-n]

(C) new <- old[,-c(i,j)]

(D) new <- subset(old,logical)

Correct Answer

(A) new <- old[-n,]

[#93] Which of the following code drop the ith and jth column?

(A) new <- old[-n,]

(B) new <- old[,-n]

(C) new <- old[,-c(i,j)]

(D) new <- subset(old,logical)

Correct Answer

(C) new <- old[,-c(i,j)]

[#94] Which of the following statement find cases with no missing values?

(A) complete <- subset(data.df,complete.cases(data.df)

(B) complete <- sub(data.df,complete.cases(data.df)

(C) complete <- subset(data.df,completeall.cases(data.df)

(D) new <- old[n1:n2,n3:n4]

Correct Answer

(A) complete <- subset(data.df,complete.cases(data.df)

[#95] Which of the following statement is normal distribution?

(A) dnorm(x, mean=0, sd=1, log = FALSE)

(B) pnorm(q, mean=0, sd=1, lower.tail = TRUE, log.p = FALSE)

(C) qnorm(p, mean=0, sd=1, lower.tail = TRUE, log.p = FALSE)

(D) rnorm(n, mean=0, sd=1)

Correct Answer

(A) dnorm(x, mean=0, sd=1, log = FALSE)