Example 6.4 (page 148) tested a therapy for anorexia, using H0: = 0 and Ha: >

Example 6.4 (page 148) tested a therapy for anorexia, using H0: μ = 0 and Ha:μ > 0 about the population mean weight change.

(a) In the words of that example, what is a (i) Type I error? (ii) Type II error?

(b) The P-value was 0.018.

If the decision for α = 0.05 were in error, what type of error is it?

(c) Suppose instead α = 0.01.

What decision would you make? If it is in error, what type of error is it?