A. What is the confidence interval and the margin of error this company is using for its quality control tests?B. How many baseballs should the company measure to be confident that the mean mass is in the acceptable range 18 times out if 20?

6. A company produces regulation baseballs. These baseballs have a mean mass of 175.0 g, with a standard deviation of .9 g. The quality control manager must ensure that the mean mass of the discs lies in the acceptable range of 174.6 to 175.4 g. He takes a random sample of discs from each batch to ensure that afew are rejected. The given table helps guide the sampling process. Confidence Level Sample Size Needed 90 % 55 95% 78 99 % 135