Consider a population that follows a normal distribution with a known standard deviation o. By what factor does changing a confidence level from 95% to 99% increase the length of a two-sided...

Extracted text: Consider a population that follows a normal distribution with a known standard deviation o. By what factor does changing a confidence level from 95% to 99% increase the length of a two-sided confidence interval for the population mean u? (Round the answer to 2 decimal places. For example, if the length would increase from 2.00 to 3.00, the answer should be 3.00/2.00 = 1.50.)