What is the range of a dataset and how is standard deviation calculated?

Question 1:
The term for the difference between the highest and lowest values in a dataset is the range.

The correct option is a).
$\boxed{\text{a. Range}}$

Question 2:
To find the standard deviation of the data, we follow these steps:

Step 1: List the data points and count the number of data points ($N$).
The data points are: $23, 21, 23, 18, 22, 25, 27, 29, 29, 25, 22, 26, 22$.
The number of data points is $N = 13