Statistical Design of Experiments
Statistical Design of Experiments
Statistical Design of Experiments
Statistical Design of Experiments
Confidence
Confidence
•
•
Confidence is a measure of the
Confidence is a measure of the
strength of the evidence against
strength of the evidence against
the null hypothesis and in
the null hypothesis and in
support of the alternative
support of the alternative
hypothesis.
hypothesis.
•
•
User chosen PRIOR to data
User chosen PRIOR to data
analysis
analysis
recommend 90% minimum
recommend 90% minimum
1 -
1 -
Confidence =
Confidence =
(alpha)
(alpha)
Type
Type I
I
error:
error:
(called
(called
= the chance /
= the chance /
probability of concluding H
probability of concluding H
A
A
when H
when H
O
O
true
true
Type
Type II
II
error:
error:
the chance / probability
the chance / probability
of failing to reject H
of failing to reject H
O
O
when H
when H
A
A
is
is
true
true
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