3. a. Most air travelers now use c-tickets. Electronic ticketing allows passengers to not worry 6.5 about a paper ticket, and it costs the airline companies less to handle than paper ticketing. However, in recent times the airlines have received complaints from passengers regarding their e-tickets, particularly when connecting flights and a change of airlines were involved. To investigate the problem, an independent watchdog agency contacted a random sample of 8 airports and collected information on the number of complaints the airport had with e-tickets for the month of March. The information is reported below. 16 12 14 13 15 14 13 12 At the .05 significance level (a), can the watchdog agency conclude the mean number of complaints per airport is less than 12 per month? Required: i. What assumption is necessary before conducting a test of hypothesis? ii. Calculate the point estimator of population mean, & and standard deviation, s. ill. Formulate the hypotheses that can be used to determine whether the mean number of complaints per airport is less than 15 per month. iv. At a=.05, can the null hypothesis be rejected? What is your conclusion? b. The federal government recently granted funds for a special program designed to reduce 6 crime in high-crime areas. A study of the results of the program in six high-crime areas of Miami, Florida, yielded the following results. Page 3 of 6 Number of Crime by Areas A BCD E F Before 14 7 4 5 17 12 After 2 7 3 6 13 Required: i. Formulate the null and alternative hypotheses to test for the difference between the population mean numbers of crime occurred in the areas since the inauguration of program. ii. Use a .05 level of significance. Can you conclude that the population means differ? What is the p-value