Given here are the descriptive statements of some claims that one intends to establish on the basis of data. In each case, identify the null and the alternative hypotheses in terms of a population proportion p.
(a) Of smokers who eventually quit smoking, less than 40% are able to do so in just one attempt.
(b) On a particular freeway, over 25% of the cars that use a lane restricted exclusively to multi-passenger cars use the lane illegally.
(c) At a particular clinic, less than 20% of the patients wait over half an hour to see the doctor.