Based on text 10.16. A new technology is believed to provide greater fuel efficiency for cars. The creators of the technology claim that the improvement is, on average, at least 3 more MPG for cars. A random sample of 41 cars is tested, with a sample mean increase of 2.4 MPG, and sample standard deviation 2.279 MPG. We're going to work through all three techniques here. What is the test statistic implied by the sample results? (Also, can we reject the null at the .05 level?) a) -2.32, b) -1.960, c) -1.685, d) -1.640