There are 460 welders employed at the Weller Shipyards Corporation. A sample of 50 welders revealed that 39 had graduated from a registered welding course. Construct the 98% confidence interval for the proportion of all welders who graduated from a registered welding course. (Round the final answers to 3 decimal places.) The confidence interval is between andWe want to estimate the population mean within 12, with a 80% level of confidence. The population standard deviation is estimated to be 33. How large a sample is required? (Round the intermediate calculation to 2 decimal places. Round the final answer to the nearest whole number.) Sample size