A researcher plans to conduct a test of hypotheses at the ? = 0.10 significance level. She designs her study to have a power of 0.70 at a particular alternative value of the parameter of interest.
The probability that the researcher will commit a Type I error is
A. 0.10.
B. 0.70.
C. 0.90.
D. equal to the P-value and cannot be determined until the data have been collected.