Hypothesis Testing: Fuel Efficiency (population means using t-stats) (datafile is posted on StatCrunch)

To gain a "gold star rating", a car must have a highway MPG fuel efficiency of at least 29.5.Suppose from the same dataset, we want to test the null hypothesis that the standard HWY MPG is 29.5 mpg. We believe that, from our data, the cars on the market in 1999 did not measure up to the gold standard and had a MPG less than 29.5 MPG.

31.What assumptions and conditions do we need to make to use inference methods with a population mean?

32.State your null and alternative hypothesis.

Conduct a hypothesis test and state the P-value. Use the 0.05 level as a threshold for significance.

conclude based on your test.