Oddly, the best hope for avoiding that 90-day wait could come from your cable company. HBO says it's in discussions with some cable, satellite and telephone providers that could sell access to HBO Now at launch, but nothing is set so far.
1 Use the Excel Formula =STDEV() and select the range of values which contain the data. 2  This calculates the sample standard deviation (n-1).3  Use the web Standard Deviation calculator and paste your data, one per line. Use the Excel Formula =STDEV() and select the range of values which contain the data. 2  This calculates the sample standard deviation (n-1).
Microsoft Excel, a spreadsheet computer program, offers a formula called CONFIDENCE to calculate the confidence interval. The interval represents the range from the survey value in which the true proportion is likely to exist.nter the standard deviation in cell A2. For example, if your standard deviation equals 1.1, enter 1.1 in cell A2. Enter the sample size in cell A3. For example, if your sample size equals 3,000, enter 3,000 in cell A3.