MGSC 7000
PRACTICE QUESTIONS

Below is the preview of dataset named “GDPdata”


Answer the following three questions:
1. Complete the code below to get the median GDP for each country.
GDPdata %>% ___________ %>% summarize(__________)

2. Complete the code below to get the mean PerCapita in year - 2014 (i.e., we need average
PerCapita across all the countries for 2014).
GDPdata %>% ___________ %>% (__________)

3. Complete the code below to get the annual mean PerCapita (i.e., we need average
PerCapita across all the countries for each year).

GDPdata %>% ___________ %>% (__________)

Expected output:


4. You have a vector date as shown below

There are three elements in numeric format. We need to convert this vector to date
format. Complete the code below (use lubricate)

date <-_________

Expected output:



5. You have two vectors v1 and v2 as shown below:


Write a code to combine v1 and v2.
Expected output


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