2. hypotheses and parameters as in exercise 1, for each of
the following situations, define the parameter and write the
null and alternative hypotheses in terms of parameter values.
a) seat-belt compliance in massachusetts was 65% in
2008. 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.