Koop Sheet Metal produces metal pipes of a standard length. Several years ago, it tested its production quality and found that the lengths of the pipes produced were normally distributed with a standard deviation of 1.1 cm. They are concerned if present production is still meeting this level of quality. They randomly selected a sample of 30 pipes, and found the standard deviation to be 1.85 cm. Test at the 95% confidence interval to verify if the company is still meeting this level of quality