Write the null and alternative hypotheses to test each of the situations in Parts a through c below. a) An article from a business journal looked at 1104 CEOs from global companies and found that 29% had MBAs. Has the percentage changed? Let p be the proportion of CEOs with an MBA. Ho : P HA : P (Type integers or decimals. Do not round.) b) Recently, 21% of cars of a certain model have needed costly transmission work after being driven between 80,000 and 140,000 kilometres. The car manufacturer hopes that the redesign of a transmission component has solved this problem. Let p be the proportion of cars needing transmission repair. Ho : P HA: P (Type integers or decimals. Do not round.) c) A market researcher for a beverage company decides to field test a new flavour soft drink, planning to market it only if he is sure that over 65% of the people like the flavour. Let p be the proportion of people who like the flavour. Ho: P HA : P (Type integers or decimals. Do not round.)