PSTAT 10 Midterm 1 UPDATED ACTUAL Exam Questions and CORRECT Answers

PSTAT 10 Midterm 1 UPDATED ACTUAL
Exam Questions and CORRECT Answers
multiply function - CORRECT ANSWER -*



exponent function - CORRECT ANSWER -^



divide function - CORRECT ANSWER -/



vectors - CORRECT ANSWER - are variables with an ordered set of values



square root function - CORRECT ANSWER - sqrt()



can a vector be named with a digit followed by a digit? - CORRECT ANSWER - no



can a vector be named by a digit followed by a period? - CORRECT ANSWER - no



are vector names case sensitive? - CORRECT ANSWER - yes



code to return the sequence of numbers 2 3 4 5 - CORRECT ANSWER - >seq(2,5)
or
>2:5


result of

>(x<-seq(2,5)) - CORRECT ANSWER - [1] 2 3 4 5
the extra parentheses give the instruction to print to screen

, function to result in a list of current objects - CORRECT ANSWER - objects()


>x<-"Hello"
>y<-"World"
>W<-c(x,y)

what's the result? - CORRECT ANSWER - [1] "Hello" "World"


>x<-"Hello"
>y<-"World"

>paste(x,y) - CORRECT ANSWER - [1] "Hello World"



date() - CORRECT ANSWER - returns current date and time


function to access a data set and indicate to R it is the data set of interest - CORRECT
ANSWER - data()



function to view a data set in top left window - CORRECT ANSWER - View()



symbol used to access a specific variable in a data set - CORRECT ANSWER -$
example: you want to access the uptake variable in the data set CO2
>CO2$uptake


5 basic data types in R - CORRECT ANSWER - Logical
Integer
Numeric
Complex
Character