R Intermediate Quiz 1

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Quiz 1
1. Which function is used to apply a function over the margins of an array or matrix?
2. What does `sapply()` return by default when possible?
3. Which package is widely used for data manipulation and features the pipe operator `%>%`?
4. Which function is used to reshape data from wide to long format?
5. What is the difference between `merge()` and `join()` in the context of dplyr?
6. Which function is used to compute the frequency of unique values in a vector?
7. How do you subset a data frame using base R with conditions?
8. Which function is used to fit a linear regression model?
9. Which command is used to save the current workspace to a file?
10. What does the `which()` function return?
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