Statistic - A characteristic or measure obtained by using the data values from a sample (This is usually denoted by ROMAN letters)
When I say "ROMAN" letters, I mean "A,B,C,D, etc."
Parameter - A characteristic or measure obtained by using the data values from a population (This is usually denoted by GREEK letters)
When I say "GREEK" letters, I mean (see below):
2. THE GREEK ALPHABET (abbreviated)
Upper and lower case
|Spoken as (in English):||Special Meaning
|Roman Letter equivalent:|
|D,d||"DELTA"||Expresses a change in a quantity||D,d|
|P,p||"PI"||Either "Multipication", or
the special number in geometry "3.1415~"
|Q,q||"THETA" ("THAY-TAH")||Geometric Angle||Th (as in "the")|
These are just a few. There are
These symbols may seem strange, but the SIGMA will be VERY important, as you will see soon.
Measures of Central Tendency
The basic idea here is that, in a given data set, we want to know where the "middle of the pack" is located. There are four different ways to do this. They are:
Read Chapter 3 in the textbook