50.
Given:
Rating
Frequency
Rel Freq
Poor
4
0.08
Below average
8
0.16
Average
11
0.22
Above average
14
0.28
Excellent
13
0.26
50
1.00
Notes:
The sample space is the 5 outcomes
S
= {poor, below average, average,
above average, excellent}.
A viewer must choose one and only one rating,
so the outcomes are mutually exclusive.
As a random sample, the viewers are strangers
to each other.
Moreover, the
viewers are probably not allowed to discuss their opinions, but must rate
alone on the basis of their own individual opinion.
As a result, the viewers
ratings are independent of each other.
The
probability
distribution:
interpret
the
relative
frequencies
as
probabilities.
For example, because 8% of those sampled gave rating of
poor, there is an 8% chance that any person selected at random will give a
rating of poor.
Rating
Prob
Cum Prob
Poor
0.0800
0.0800
Below average
0.1600
0.2400
Average
0.2200
0.4600
Above average
0.2800
0.7400
Excellent
0.2600
1.0000
sum =
1.0000
Probabilities are assigned using the relative frequency method.
(E.g., 4 of
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '08
 SINGER
 Probability theory, probability density function, 8%, PROB, Harvey Singer

Click to edit the document details