Lecture 9 Chapter 8 (2) - Slide 1 Chapter 8 Introduction to...

Slide 1
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Chapter 8: Introduction
to Hypothesis Testing
Spring 2010

Slide 2
Hypothesis Testing
The hypothesis test is used to
evaluate the results from a research
study in which
n
A sample is selected from the
population.
n
The treatment is administered to the
sample.
n
After treatment, the individuals in the
sample are measured.

Slide 3
Hypothesis Testing
n
Hypothesis testing is a technique
to help determine whether a
specific treatment has an effect
on the individuals in a
population.
n
The general goal of a hypothesis
test is to rule out chance
(sampling error) as a plausible
explanation for the results from a
research study.

Slide 5
Hypothesis Testing (cont.)
n
If the individuals in the sample are
noticeably different from the
individuals in the original population,
we have evidence that the treatment
has an effect.
n
However, it is also possible that the
difference between the sample and
the population is simply sampling
error

Slide 8
New terms
Null Hypothesis
Alpha Level
Critical Region
Test Statistic
Type 1 & Type II errors

Slide 9
Five-step procedure for hypothesis