R Intermediate Quiz 3

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Quiz 3
1. Which function is used for random sampling with replacement?
2. How to join data frames by a common column in dplyr?
3. Which function generates a sequence of numbers with a specified length?
4. What is the main use of the `mutate()` function?
5. Which argument in `read.csv()` specifies the separator?
6. Which function is used to create a group-wise summary?
7. How to remove NA values from a vector?
8. What is the result of applying `unlist()` to a list?
9. Which package is used for advanced data visualization (layered graphics)?
10. What does the `rep(x, each = 2)` function do?
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