Some journals have a policy of publishing research results only if they achieve statistical significance at the 0.05 α-level.

(a) Explain the dangers of this.

(b) When medical stories in the mass media report supposed large dangers or benefits of certain agents (e.g., coffee drinking, fiber in cereal), later research often suggests that the effects are smaller than first believed, or may not even exist. Explain why.

Select the correct response(s) in Exercises 6.52–6.56. (More than one may be correct.)