grams): 29.3, 28.2, 29.1, 28.7, 28.9, 28.5. Create a 95% confidence interval for the mean weight of such bagsof chips. Explain in context what your interval means. Comment on the company’s stated net weight of 28.3 grams.226.One of the important factors in auto safety is the weight of the vehicle. Insurance companies are interested in knowing the average weight of cars currently licensed in the United States; they believe it is 3000 pounds. Tosee if that estimate is correct, they checked a random sample of 91 cars. For that group the mean weight was 2919 pounds, with a standard deviation of 531.5 pounds. Is this strong evidence that the mean weight of all cars is not 3000 pounds? Use a .01 level of significance. 227.A manufacturer claims that a new design for a portable phone has increased the range to 150 feet, allowing many customers to use the phone throughout their homes and yards. An independent testing laboratory foundthat a random sample of 44 of these phones worked over an average distance of 142 feet, with a standard deviation of 12 feet. If there evidence that the manufacturer’s claim is false? Use a .05 level of significance.