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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 σ=2 mpg. The research question is to test whether mean gas mileage has increased since 2014.

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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

Question 9.100

image 65. Try to answer the following questions by thinking about the relationship between the statistics instead of by redoing all the calculations. Note the mpg of the worst-performing Prius: 48.1. What if the 48.1 mpg is a typo? We are not sure what the actual mpg is, but it is greater than 48.1 mpg. How would this change affect the following?

  1. ˉx
  2. σ (Hint: This is not the sample standard deviation.)
  3. n
  4. Zdata
  5. Zcrit
  6. The conclusion

9.2.65

(a) Increase (b) Stay the same (c) Stay the same (d) Increase (e) Stay the same (f) Stay the same

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