To encourage telephone efficiency, a catalog call center issues a guideline that at least half of all telephone orders should be completed within 2 minutes. Subsequently, a random sample of 64 telephone calls showed that only 24 calls lasted 2 minutes or less.
(a) At α = .05 is this a significant departure from the guideline in a left-tailed test? State your hypotheses and decision rule.
(b) Find the p-value.
(c) Is the difference important (as opposed to significant)?