o Loans made and intended to be sold by the originating lender or creditor to FNMA, GNMA, or FHLMC (or its successor); 7 or o Loans that are the subject of a home equity conversion mortgage or reverse mortgage issued by a lender or creditor subject to the regulation. 4
1 Draw the max line -- the one with as large a slope as you think reasonable (taking into account error bars), while still doing a fair job of representing all the data. Measure the slope of this line.  Calculate the uncertainty in the slope as one-half of the difference between max and min slopes.
5. Calculate your margin of error. You can find the margin of error by using the following formula: Za/2 * Ï/â(n). Z a/2 = the confidence coefficient, where a = confidence level, Ï = standard deviation, and n = sample size. This is another way of saying that you should multiply the critical value by the standard error.. Calculate your margin of error. You can find the margin of error by using the following formula: Za/2 * Ï/â(n). Z a/2 = the confidence coefficient, where a = confidence level, Ï = standard deviation, and n = sample size. This is another way of saying that you should multiply the critical value by the standard error.