Knowledge Quiz: Pipes

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Which of the following commands will compute the mean of the age variable from the bfi dataset?

bfi %>% mean(age)bfi$age %>% mean()bfi %>% mean()$agebfi |> mean(age)bfi %>% mean(age, .)

• Incorrect
• Correct: This command uses the dplyr pipe operator, %>%, to pass bfi$age to the mean() function.
• Incorrect
• Incorrect
• Incorrect

Which of the following pipelines includes a valid use of the placeholder symbol (., or _)?

bfi %>% lm(extra ~ age, data = _)bfi |> lm(extra ~ age, data = .)bfi %>% lm(extra ~ age, data = .)bfi |> lm(extra ~ age)bfi |> lm(extra ~ age, _)

• Incorrect: Uses the wrong placeholder symbol
• Incorrect: Uses the wrong placeholder symbol
• Correct
• Incorrect: No placeholder. This code will fail because the dataset is not the first argument in lm().
• Incorrect: With the Base R pipe, you can only use the placeholder symbol for a named argument.