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Which of these statements is true about the power of a test? a. We accept a certain beta error when testing; normally this error is

Which of these statements is true about the power of a test?

a.

We accept a certain beta error when testing; normally this error is 50%.

b.

Statistical power is one minus the beta error.

c.

You can never measure statistical power ex ante.

d.

A test is optimized if its power is equal to 1.

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