Question: Write the null and alternative hypothesis to test each of the following situations.

a. A business magazine article reports that in 1990 35% of CEO’s had an MBA degree. Has the percentage changed?

b. Recently 20% of cars of a certain model have needed costly transmission repairs after being driven between 50,000 and 100,000 miles. The car manufacturer hopes that the redesign of a transmission component has solved the problem

c. A market researcher for a cola company decides to field test a new flavor soft drink, planning to market if only if he is sure that over 60% of the people like the flavor.