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Point out the correct statement?

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Point out the correct statement?

(a) Each row is an observation in tidy data

(b) Each column is a variable in tidy data

(c) Arranging your data in tidy way makes it easier to work

(d) All of the mentioned

The question was asked during an interview.

My question is taken from Data Wrangling in division Profiling, Simulation and Data Analysis of R Programming

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Right choice is (d) All of the mentioned

The explanation: When use tidy data and tidy tools, you spend less time worrying about how to feed the output from one function into the input of another.

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