summarize not found

why do I keep getting an error when trying to use summarize?

Error in summarize(., mean(x), sd(x), mean(y), sd(y), cor(x, y)) :
could not find function "summarize"

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Did you library(tidyverse) or library(dplyr)?

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do you have to those packages every single time?

You have to load those packages every single session. They stay in place within a session once loaded. (Unless you clear them out.)

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