Write the null and alternative hypotheses to test each of the following situations.
a) A 2010 Harvard Business Review article looked at 1109 CEOs from global companies and found that 32% had MBAs. Has the percentage changed?
b) Recently, 20% of cars of a certain model have needed costly transmission work after being driven between 50,000 and 100,000 miles. The car manufacturer hopes that the redesign of a transmission component has solved this problem.
c) A market researcher for a cola company decides to field test a new soft drink flavor, planning to market it only if he is sure that over 60% of the people like the flavor.