Lab 10

Create a function that takes a variable as input and outputs a standardized version of that column.

• A standardized / normalized variable takes the datapoint (each row / observation) minus the mean of the variable divided by the standard deviation of the variable. In mathematical notation, \(Z = \frac{x - \mu}{ \sigma}\)
• Build in tests and stops that makes sure the variable (1) has more than one observation (length()), and (2) is numeric.
• Build in a return statement

Load the gapminder data and run your function on gapminder$lifeExp and gapminder$country. Show the first six values of the output.