nominal scale
the order doesnt matter, labled (gender, etc.)
ordinal scale
order does matter, (agree, strongly agree, ect)
interval scale
numeric data (fixed unit of matter- temp)
ratio scale
numeric (income, age)
elements (data set)
what the data is collected on (hotels, etc)
variables (data set)
characteristics of the thing the data is taken on (country, rate, score, etc.)
an observation (data set)
what was being observed
categorical data
nominal and ordinal scale
quantitative data
interval and ratio scale
cross sectional data
data collected at once
time series data
data collected over a period of time (sales for the year)
continuous random variables
variable that may assume any numerical value in an interval
discrete random variable
a variable which can only take a countable number of values. In this example, the number of heads can only take 4 values (0, 1, 2, 3)