4.2 Confidence Intervals and Hypothesis Testing Assignment You must use the 4-Step Process. You must show all work and all steps must be clearly labeled. Submitting just answers will result in a grade of 0. All unexplained numbers will be ignored and final answers must be written in complete sentences. Use our example as a guide. A car manufacturer wants to test a new engine to determine whether it meets the air-pollution standards. The mean emissions of all engines of this type must be less than 18.5 parts per million of carbon. A random sample of ten engines are manufactured for testing purposes, and the emission level of each is determined. The data are listed: 16.5 12.6 25.2 25.0 14.6 19.4 16.6 19.7 17.2 13.9 Do the data supply sufficient evidence to allow the manufacturer to conclude that this type of engine meets the pollution standard? Assume the shape of the sampling distribution is approximately normal. Use a = 0. 01