Question (1).

a) How to check your current working directory and set your working directory in R?

b) The uspopchange is a R object. What is the command to save uspopchange as a uspopchange.rda in your current working directory?

c) What command do we use to import uspopchange.rda, as R object, in R environment?

d) What is the command we use to save a R object e.g. uspopchange as a csv file, e.g. uspopchange.csv, in your current working directory?

e) What is the command we use to save a R object e.g. uspopchange as a txt file, e.g. uspopchange.txt, in your current working directory?

f) What are the commands used to import uspopchange.txt file and uspopchange.csv file as R object?

g) What command is used to remove any object from R environment?

h) What are the benefits that we get using attach() function in R?

i) Why do we use function library (package name)? Are library( ) and require( ) functions are different?

j) How to compute summary of R data set uspopchange? Write its corresponding output.