Summary Statistics Made Simple As It

Statistics

A collection of methods for
• Obtaining,
Descriptive Statistics • Organizing,
• Summarizing,
• Presenting,
• Analysing and
Inferential Statistics
• Interpreting the data, and then drawing
conclusions from it.

,e.g. All STAT370 Population – all items
with a characteristic Problems
students this • Expensive
semester of interest (size N)
• Not practical
• Time consum

Generalize the Census – a
findings from the study of all
sample to the e.g. 100 STAT
items in the students th
population pop.
semester



Study only Sample – a su
Take a of the popula
the items in sample
the sample (size n)

, A Variable
A characteristic that can assume different values
Example:
DISCRETE Variable
The number
Assumes a finite, or countable,
STAT370 stude
number of possible values
a lecture.
CONTINUOUS Variable
Example:
Assumes an infinite number of
The height of
possible values (in an interval
STAT370 stude
between two values)

Data Set: A set of measurements, counts,
or descriptions of the characteristic of the
members being studied.

, More examples

The number of car accidents in
discrete
an intersection


The weight of fish in a tank
continuous


The time it takes to complete a
marathon continuous


The flavours of milkshakes at
discrete
McDonalds