The high price of medicines is a source of major expense for those seniors in the United States who have to pay for these medicines themselves. A random sample of 2100 seniors who pay for their...

The high price of medicines is a source of major expense for those seniors in the United States who have to pay for these medicines themselves. A random sample of 2100 seniors who pay for their medicines showed that they spent an average of $4100 last or medicines with a standard deviation of $700 Make a 99% confidence interval for the corresponding population mean.