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