When I attach a package to my workspace using the library() function, I have to re-attach with the library() function (or similar) every time I start a new workspace

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

1- When I attach a package to my workspace using the library() function, I have to re-attach with the library() function (or similar) every time I start a new workspace.

A. True

B. False

 

2- When I install a package to my instance of R, I have to re-install every time I open a new instance of R (or RStudio).

A. True

B. False

 

3-Create a vector with the following code:

r <- runif(20)

This creates a vector of twenty elements that are random numbers between 0 and 1. Be advised, every time you run this code you will get a different set of numbers and your numbers are different than mine.

Using a for loop (and an if-statement), iterate through the vector and print out the elements of the vector that are greater than 0.5.

Place the code here.

 

 

Maximum number of characters (including HTML tags added by text editor): 32,000

 

4- Suppose you have the following vector: w <- 1:10

Using a for-loop, and any other control statements you find necessary, print out the values of the vector w that are odd.

That is, using a for-loop, iterate through the elements of w and print out the ones that are odd. That is the only requirement.

Place the code here.

 

Maximum number of characters (including HTML tags added by text editor): 32,000

 

5- Suppose you have three variables: x, y, and z. Suppose they could theoretically take on any value BUT they cannot/will not take on the same value. Create a series of nested if-else statements that output the order of x,y, and z in ascending order. That is, suppose the following:

 

x = 2

y = 4

z = 5

 

Then the if-else "tree" should ultimately print out "x,y,z".

But if the values were the following: 

x=7

y=4

z=5

Then the output would be: "y,z,x"

 

 

6- Import the dataset "Marine Reenlistment Data.xlsx". (Or "Marine Reenlistment Data.csv")  Either of which may be found at Resources -> Data. 

 

Create a new variable called Superior_PFT. This variable takes on a value of 1 if the individual's `Physical Fitness Test Score` is greater than or equal to 280, and 0 otherwise.

 

 

Maximum number of characters (including HTML tags added by text editor): 32,000

 

 

7- Create a subset of the data frame you create when you import the file above. This subset should contain all rows and the following columns: ID, Reenlisted, Present Grade, Occupational Field, and Civilian Education.

 

 

Maximum number of characters (including HTML tags added by text editor): 32,000

 

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