1 / 5   If you want to convert from wide to long form with the package reshape2 you use the function:

melt freeze subset corr

2 / 5   Which programming languages are most popular for data science?

SQL, Python, and R F#, Erlang, and LISP C#, Java, and Javascript SPSS, SAS, and Stata

3 / 5   What describes data sets of the past compared to today's data sets?

They were small, slow, and little diversity They provided little value They were stored in mainframes They were largely paper based

4 / 5   In the past, data analysis was largely limited to whom?

Business analysts Life hackers and hobbyists Data-driven decision makers Scientists and statisticians

5 / 5   Which command do you use to measure the strength of the relationship between two numeric variables?

cor() table() mean() sd()