i need help with part 2 finding Z

An airline's data indicate that 50 percent of people who begin the online process of booking a flight never complete the process and pay for the flight. To reduce this percentage, the airline is considering changing its website so that the entire booking process, including ight and seat selection and payment, can be done on two simple pages rather than the current four pages. A random sample of 300 customers who begin the booking process are exposed to the new system, and 117 of them do not complete the process. (1) Formulate the null and alternative hypotheses needed to attempt to provide evidence that the new system has reduced the noncompletion percentage. EE-i--E (2) Use critical values and a pvalue (=0.00007) to perform the hypothesis test by setting 0 equal to 0.10, 0.05, 0.01, and 0.001. (Negative value should be indicated by a minus sign. Round 2 to 2 decimal places.) m -3.31