Kathy sets out wanting to find an 80% 80% confidence interval for a population mean; however, she later decides that she wants to know the 90% 90%...

confidence interval for a population mean; however, she later decides that she wants to know the

confidence interval for that same population mean. How will this affect the width and the margin of error of her confidence interval for a population mean? Assume that the population standard deviation is unknown and the population distribution is approximately normal.