Question: An automobile manufacturer substitutes a different engine in cars that
An automobile manufacturer substitutes a different engine in cars that were known to have an average miles-per-gallon rating of 31.5 on the highway. The manufacturer wants to test whether the new engine changes the miles-per-gallon rating of the automobile model. A random sample of 100 trial runs gives x-bar = 29.8 miles per gallon and s = 6.6 miles per gallon. Using the 0.05 level of significance, is the average miles-per-gallon rating on the highway for cars using the new engine different from the rating for cars using the old engine?
Answer to relevant QuestionsIn controlling the quality of a new drug, a dose of medicine is supposed to contain an average of 247 parts per million (ppm) of a certain chemical. If the concentration is higher than 247 ppm, the drug may cause some side ...Average total daily sales at a small food store are known to be $452.80. The store's management recently implemented some changes in displays of goods, order within aisles, and other changes, and it now wants to know whether ...The manufacturer of electronic components needs to inform its buyers of the proportion of defective components in its shipments. The company has been stating that the percentage of defectives is 12%. The company wants to ...Airplane tires are sensitive to the heat produced when the plane taxis along runways. A certain type of airplane tire used by Boeing is guaranteed to perform well at temperatures as high as 125°F. From time to time, Boeing ...Borg-Warner manufactures hydroelectric miniturbines that generate low-cost, clean electric power from the energy in small rivers and streams. One of the models was known to produce an average of 25.2 kilowatts of ...
Post your question