PSTAT 10 FINAL UPDATED ACTUAL Exam Questions and CORRECT Answers

PSTAT 10 FINAL UPDATED ACTUAL
Exam Questions and CORRECT Answers
x<-7:10 - CORRECT ANSWER - creates a vector 7 through
7 8 9 10


2^(0:10) - CORRECT ANSWER - 2 to the power of all values in a vector from 0 to 10



rm(x) - CORRECT ANSWER - removes object x



q() - CORRECT ANSWER - quit Rstudio



x<-c(3,7,9) - CORRECT ANSWER - c is combine function
379


1) x<-c("hello","world")

2) paste("hello", "world") - CORRECT ANSWER - 1) "hello" "world"
2 " hello world"


date() - CORRECT ANSWER - gives today's time and date


?paste

help(paste) - CORRECT ANSWER - help function



getwd() - CORRECT ANSWER - get work directory



setwd() - CORRECT ANSWER - set working directory

, data("CO2")

View(CO2) - CORRECT ANSWER - indicates data set of interest
view CO2 in top left pane
(CAPITAL V)


CO2$uptake - CORRECT ANSWER - only takes data from uptake column in CO2 data



5 basic object classes in R - CORRECT ANSWER - logical(T,F)
integer(1,2,3,4)
numeric(2.2 3.355, 3,pi)
complex(i, 3i, 4i)
character("A", "APPLE")


Data structures - CORRECT ANSWER - vector
matrix
data frame
factors
tables


Vector Syntax - CORRECT ANSWER - vector(class of object, length)



typeof(z) - CORRECT ANSWER - gives class of vector
"character", "numeric"


length(x) - CORRECT ANSWER - gives vector length