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www.helpyourmath.com is an OER website to help students to save money on textbooks and homework systems. A survey of 22 randomly selected students finds that they save a mean of $195 per semester by using www.helpyourmath.com. Assume the date comes from a normal distribution and the sample standard deviation is $10 per month.Confidence Interval: What is the 90% confidence interval to estimate the population mean? Round your answers to two decimal places.____ < p < ____
