STT 200 exam 1 Questions and Answers (100% Correct Answers) Already Graded A+

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STT 180 Exam 1 Questions and Answers (100%
Correct Answers) Already Graded A+
Is a dplyr function that chooses rows matching a set of criteria Ans:
filter()


ex. flights %>%
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filter(air_time > 60)


Is a dplyr function that chooses rows using indices Ans: slice()
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ex. slice(mtcars, 1:3)


Is a function of dplyr that chooses columns by name Ans: select()


ex. mtcars %>%


select(mpg, hp, wt)


Grabs a column as a vector Ans: pull()


ex. mtcars %>%


pull(1) or pull(cyl)


rename specific columns Ans: rename()

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ex. mtcars %>%


rename(NewName = OldName)


reorder rows in ascending and descending order Ans: arrange()


ex. mtcars %>%


arrange(cyl) ##Ascending
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arrange(cyl,mpg) ##Reorders both


arrange(desc(cyl)) ##Descending
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adds new variables to the data frame Ans: mutate()


ex. mtcars %>%


mutate(new_variable = mpg/5)


creates a new data frame with new variables Ans: transmute()


ex. mtcars%>%


transmute(new_var = mpg/5)


filters for unique rows (so it gets rid of duplicates) Ans: distinct()