R Programming MCQ Questions with answers and solutions Page 73

Q. How do you count the number of distinct values in a column named category in dplyr?

(A) count_distinct(category)
(B) distinct_count(category)
(C) calculate_distinct(category)
(D) n_distinct(category)

💬 Discuss

✅ Correct Answer: (D) n_distinct(category)

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. In dplyr, how do you filter rows based on multiple conditions using the AND logic?

(A) filter(condition1 & condition2)
(B) filter_all_of(condition1, condition2)
(C) filter_condition(condition1 & condition2)
(D) filter(conditions = condition1, condition2)

💬 Discuss

✅ Correct Answer: (A) filter(condition1 & condition2)

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. What does the desc() function do in dplyr?

(A) Sorts a column in descending order
(B) Describes the summary statistics of a column
(C) Discretizes a numeric column
(D) Disassembles a string column

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✅ Correct Answer: (A) Sorts a column in descending order

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. What is the purpose of the ungroup() function in dplyr?

(A) Retains the grouping of the data frame
(B) Removes the grouping of the data frame
(C) Unpacks nested data frames
(D) Reorders the rows based on a specific column

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✅ Correct Answer: (B) Removes the grouping of the data frame

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. How do you select distinct values from a column named category in dplyr using distinct()?

(A) distinct_values(category)
(B) select_distinct(category)
(C) unique(category)
(D) distinct(category)

💬 Discuss

✅ Correct Answer: (D) distinct(category)

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. In dplyr, what does the slice() function do?

(A) Extracts specific rows from a data frame
(B) Selects specific columns from a data frame
(C) Slices a data frame into smaller data frames
(D) Sorts the data frame in ascending order

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✅ Correct Answer: (A) Extracts specific rows from a data frame

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. What does the rename_all() function do in dplyr?

(A) Renames all variables in a data frame
(B) Renames all columns in a data frame
(C) Renames all levels in a factor variable
(D) Renames all rows in a data frame

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✅ Correct Answer: (B) Renames all columns in a data frame

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. How do you calculate the median of a numeric variable named price for each group in dplyr?

(A) summarize(median_price = median(price))
(B) calculate_median(price)
(C) median_group(price)
(D) median(price)

💬 Discuss

✅ Correct Answer: (A) summarize(median_price = median(price))

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. In dplyr, how do you select columns that match a specific pattern using the select() function?

(A) select(pattern = "specific_pattern")
(B) choose_cols(matches("specific_pattern"))
(C) select(columns = matches("specific_pattern"))
(D) pick_cols(pattern = "specific_pattern")

💬 Discuss

✅ Correct Answer: (B) choose_cols(matches("specific_pattern"))

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

Q. What function is used to remove missing values from a dplyr data frame?

(A) clean_na()
(B) remove_missing()
(C) na_omit()
(D) filter_na()

💬 Discuss

✅ Correct Answer: (C) na_omit()

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:13 am in R Programming

R Programming MCQs with answers Page - 73

Q. How do you count the number of distinct values in a column named category in dplyr?

Q. In dplyr, how do you filter rows based on multiple conditions using the AND logic?

Q. What does the desc() function do in dplyr?

Q. What is the purpose of the ungroup() function in dplyr?

Q. How do you select distinct values from a column named category in dplyr using distinct()?

Q. In dplyr, what does the slice() function do?

Q. What does the rename_all() function do in dplyr?

Q. How do you calculate the median of a numeric variable named price for each group in dplyr?

Q. In dplyr, how do you select columns that match a specific pattern using the select() function?

Q. What function is used to remove missing values from a dplyr data frame?

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