Data Manipulation with dplyr MCQ question and answer with solution | R Programming MCQs

A. mean(score)

B. calculate_mean(score)

C. avg(score)

D. summarize(mean_score = mean(score))

A. rename_cols()

B. rename()

C. change_names()

D. alter_columns()

A. filter_not_missing()

B. missing_filter()

C. filter(is_not_missing())

D. filter(!is.na(variable))

A. count_rows()

B. n()

C. rows_count()

D. summarize(count = n())

A. top_n(5, value)

B. select_top(5, value)

C. arrange(desc(value))

D. filter_top(5, value)

A. Groups the data frame by a specified column

B. Creates a new variable based on existing ones

C. Orders the rows based on a specific column

D. Filters unique rows based on specified columns

A. select(starts_with("partial_name"))

B. select(name_contains("partial_name"))

C. select(partial_name)

D. choose_columns("partial_name")

A. filter_all_conditions()

B. filter(multiple_conditions)

C. filter_conditions_all()

D. filter(multiple = conditions)

A. join_inner()

B. inner_merge()

C. merge_inner()

D. inner_join()

A. summarize(count = n())

B. summarize(total_count = count())

C. summarize(total = n())

D. calculate(count = n())