Question: A medical researcher estimates that no more than 55% of U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say they eat breakfast every day. At ? =0.01, is there enough evidence to reject the researcher’s claim? (Adapted from U.S. National Center for Health Sciences)

(a) Write the claim mathematically and identify H 0 and H a .

(b) Find the critical value(s) and identify the rejection region(s).

(c) Find the standardized test statistic.

(d) Decide whether to reject or fail to reject the null hypothesis.

(e) Interpret the decision in the context of the original claim.