X can be pretty much anything in this context, some examples:
x = a person's weight in kg
x = a person's IQ
x = The number of lottery tickets bought this month
I'm reading about Sampling Distribution of a Sample Mean and don't understand what this variable x could be. Maybe some examples of what the variable x could be will help me understand.
The book states:
"Suppose that a variable of a population has mean and standard deviation ."
Then it goes on to list some properties that do make sense to me.
Thank you. :-)