(Solution) - The Excel file Mortgage Rates contains time series data on rates -(2025 Original AI-Free Solution)

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The Excel file Mortgage Rates contains time?series data on rates of three different mortgage instruments. Assuming that the data are stationary, construct a 95% confidence interval for the mean difference between the 30?year and 15?year fixed rate mortgage rates. Based on this confidence interval, would you conclude that there is a difference in the mean rates?