In dplyr, how do you calculate the sum and mean of a numeric variable named quantity for each group?
A. summarize(total = sum(quantity), average = mean(quantity))
B. calculate(sum = sum(quantity), mean = mean(quantity))
C. summarize(sum_quantity = sum(quantity), mean_quantity = mean(quantity))
D. total_mean(quantity)
Answer: Option A
This Question Belongs to R Programming >> Data Manipulation With Dplyr
In dplyr, what function is used to select specific columns from a data frame?
A. select_cols()
B. choose_cols()
C. select()
D. pick()
How do you filter rows in a dplyr data frame based on a specific condition using filter()?
A. filter_rows()
B. row_filter()
C. filter_conditions()
D. filter()
In dplyr, what does the arrange() function do?
A. Sorts the data frame in ascending order
B. Arranges the columns in a specified order
C. Orders the rows based on a specific column
D. Sorts the data frame in descending order
What function is used to create a new variable in a dplyr data frame based on existing variables?
A. create_var()
B. mutate()
C. new_variable()
D. add_column()
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