Read these data into the R workspace. Correctly specify the types of each variable based on the information you find in the data.

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

Sample Question 1

This is a printed outcome of a list object. The list includes information about indie record labels.

. 2.1 Using base R functions (i.e. $ and [).print all artists’ name that belongs to Polyvinyl.

## $jigsaw_rec

## $jigsaw_rec$website

## [1] “https://jigsaw—records.com”

##

## $jigsaw_rec$artists

## [1] “So Cow” “Half Foward Line”

##

##

## $slumberland_rec

## $slumberland_rec$website

## [1] “www.slumberlandrecords.com”

##

## $slumberland_rec$artists

## [1] “Black Tambourine” “Mercury Girls” “Tony Molina”

##

##

## $polyvinyl_rec

## $polyvinyl_rec$website

## [1] “https: //www.polyvinylrecords .com”

## $polyvinyl_rec$artists

## [1] “Alvvays” “of Montreal” “Pedro the Lion”

. Make a vector that only contains website address of the record lables. Use the name of the labels to

name vector elements.

Sample Question 2

census .csv is a small subset of the U.S. census data. When you open this dataset with a text editor app (e.g., Notepad, Texteciit, Excel), you

will notice there’s some additional information about variable types in the beginning of the file.

. Read these data into the R workspace. Correctly specify the types of each variable based on the information you find in the data.

. Check out if any variable in this data has a missing value. Delete all the observations that have any missing value from the data using only R base operators. Create a new object with no missing value.

. Check out if any variable in this data has a missing value. This time. delete all the observation that has any missing value from the data

using one of the dplyr () functions. Create a new object with no missing value.

Sample Question 3

For this sample question, I will share the questions only.

• Read exam time. csv and convert time variable into a standard date/time format.

• We have a date/time variable stored in date_time. RDS . The current time in the variable is formatted in US Eastern Time

(“America/New_York”). Convert the time zone of the date/time variable into “America/Chicago” using a function with_tz which is a part

of lubridate() package.

Attachments:

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