As in Exercise 1, for each of the following situations, write the null and alternative hypotheses in terms of parameter values.
a) A recent UMass-Amherst study found that seat-belt compliance in Massachusetts was 73% in 2011. The state wants to know if it has changed.
b) Last year, a survey found that 45% of the employees were willing to pay for on-site day care. The company wants to know if that has changed.
c) Regular card customers have a default rate of 6.7%. A credit card bank wants to know if that rate is different for their Gold card customers.