# Assessment B

For the second in-class assessment, you should be familiar with the syntax and ideas behind the following:

• loading an R package (use library(packagename))
• compute the mean or sum of a variable inside a dataset (use mean(dataname$variable) or sum(dataname$variable))
• loading a CSV file into R (using read_csv)
• describe the layout of a CSV file; you should be able to construct one from hand based on a description of a dataset
• identify and describe observations (rows), variables (columns) and know that these are stored in a data frame
• describe what the unit of analysis of a given dataset is by looking at the data

The assessment includes fill in the blank questions, not just multiple choice, so make sure you remember the specific function commands (library, read_csv, ect.).