This preview shows pages 1–3. Sign up to view the full content.
In Chapter 2, we summarized and describe the data using tables and graphs.
In Chapter 3, we will summarize and describe the data using numbers.
•
Sample Statistics
: numbers that describe a sample
•
Population Parameters
: numbers that describe a population
Measures of Location
Mean
: the average value
•
A measure of the central location of the data.
•
The population mean is denoted by
μ
.
To compute the population mean:
μ
=
∑
N
i
=1
x
i
N
N
is the number of units in the population.
The observations are
x
1
,x
2
,...,x
N
.
•
The sample mean is denoted by ¯
x
.
To compute the sample mean:
¯
x
=
∑
n
i
=1
x
i
n
n
is the number of units in the sample. The observations are
x
1
,x
2
,...,x
n
.
1
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentExample
: A sample of 10 NCAA college basketball games provided the fol
lowing winning margins (in points).
24 19 5 21 8 3 6 6 10 20
What is the average winning margin?
Median
: the middle value
•
A measure of the central location of the data.
To compute the median:
This is the end of the preview. Sign up
to
access the rest of the document.
 Fall '10
 Jager,AbigailL
 Statistics

Click to edit the document details