Toyota Prius Gas Mileage. Use the following information for Exercises 60–67. Cars.com reported in 2014 that the mean city/highway combined gas mileage for the Toyota Prius hybrid car was 50 mpg. This year, a random sample of 16 Toyota Prius cars had the gas mileages shown here (in miles per gallon (mpg)). Assume . The research question is to test whether mean gas mileage has increased since 2014.
507
| 48.1 | 49.9 | 50.6 | 51.8 |
| 48.8 | 50.0 | 50.9 | 52.2 |
| 49.3 | 50.2 | 51.3 | 52.9 |
| 49.5 | 50.4 | 51.6 | 53.9 |
62. Find the critical value and state the rejection rule. Use level of significance .