An online survey asked 397 how muA crop scientist is conducting research with a drought resistant corn hybrid. She is interested in determining if using fertilizer X will increase yield. She prepares 28 single acre plots and randomly assigns 14 to have normal soil while the other 14 are planted with fertilizer X. The resulting average yield for each group of 14 plots was recorded. ch extra in taxes they would be willing to pay to protect the environment. The sample average was $599 with a sample standard deviation of $180. Is it appropriate to use a normal distribution to approximate a confidence interval for the population mean? If it’s inappropriate, indicate why.