Define these key terms

1. Latent variable: a variable that we didn’t measure but infer from our data
2. Mean: the average value, calculated as the sum of the values divided by n
3. Standard deviation: the spread of values, calculated as the square root of the sum of the squared deviations divided by n

​Fill in the gaps

1. The median is the middle value in an ordinal data set
2. The inter-quartile range can be used to measure dispersion in an ordinal. variable.
3. The measure of central tendency for a categorical variable is the mode.

Identify the variable type for each of the variables