Identify the null and the alternative hypotheses in the following situations.
(a) A university official believes that the proportion of students who currently hold part-time jobs has increased from the value .26 that prevailed four years ago.
(b) A cable company claims that, because of improved procedures, the proportion of its cable subscribers that have complaints against the cable company is now less than .13.
(c) Referring to part (b), suppose a consumer advocate feels the proportion of cable subscribers that have complaints against the cable company this year is greater than .13. She will conduct a survey to challenge the cable company's claim.
(d) An inspector wants to establish that 2 × 4 lumber at a mill does not meet a specification that requires at most 5% break under a standard load.