Margin Of Error Calculation In Excel
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Confidence Interval Excel 2013
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Margin Of Error Formula Statistics
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Confidence Coefficient For 90
Calculator Statistics Blog Calculus Matrices Practically Cheating Statistics Handbook Navigation How to Calculate Margin of Error in Easy Steps Probability and Statistics > Critical Values, Z-Tables & Hypothesis Testing > How to Calculate https://www.youtube.com/watch?v=siqx4PbqJ6s Margin of Error Contents (click to skip to that section): What is a Margin of Error? How to Calculate Margin of Error (video) What is a Margin of Error? The margin of error is the range of values below and above the sample statistic in a confidence interval. The confidence interval is a way to show what the uncertainty is with a certain statistic (i.e. from a poll http://www.statisticshowto.com/how-to-calculate-margin-of-error/ or survey). For example, a poll might state that there is a 98% confidence interval of 4.88 and 5.26. That means if the poll is repeated using the same techniques, 98% of the time the true population parameter (parameter vs. statistic) will fall within the interval estimates (i.e. 4.88 and 5.26) 98% of the time. What is a Margin of Error Percentage? A margin of error tells you how many percentage points your results will differ from the real population value. For example, a 95% confidence interval with a 4 percent margin of error means that your statistic will be within 4 percentage points of the real population value 95% of the time. The Margin of Error can be calculated in two ways: Margin of error = Critical value x Standard deviation Margin of error = Critical value x Standard error of the statistic Statistics Aren't Always Right! The idea behind confidence levels and margins of error is that any survey or poll will differ from the true population by a certain amount. However, confidence intervals and margins of error reflect the fact that there is room for error, so although 95% or 98% confidence with a 2 percent Mar
visit from the selection below. Home » ExcelBanter forum » Excel Newsgroups » Excel Programming Margin of Error Formula Author Name Remember Me? http://www.excelbanter.com/showthread.php?t=286163 Password Site Map Home Register Authors List Today's Posts Search Web Partners Search Forums Show Threads Show Posts Advanced Search Go to Page... Margin of Error Formula « Previous Thread | Next Thread » Thread Tools Display Modes #1 December 24th 03, 12:51 AM posted to microsoft.public.excel.programming Heather Rabbitt external usenet poster Posts: 2 Margin of Error Formula Hi, I'm looking for a confidence interval formula in excel to give me the maximum and minimum margin of error at the 95% confidence interval for a given percentage and sample size. For example the percentage may be 50% I have a sample size of 16 and using a stat testing program (STATCHCK) I know the margin of error is +/- 25% so my maximum would be 75% and my minimum would be 25%. My confidence interval excel problem is I have over 10,000 numbers to check and I want to automate this in excel. I know there is a data analysis add in excel but not sure if it can be used to solve my problem. Any help with my problem would be greatly appreciated. If you think this should be posted somewhere else please let me know. Thanks in advance, Heather Heather Rabbitt View Public Profile View message headers Find all posts by Heather Rabbitt Find all threads started by Heather Rabbitt Ads #2 December 24th 03, 01:37 AM posted to microsoft.public.excel.programming Tom Ogilvy external usenet poster Posts: 27,285 Margin of Error Formula the standard error for your sample percentage is = sqrt(((100-percentage)*percentage)/n-1) assume 50% is in A1, 16 in B1 = sqrt(((100%-A1)*A1)/(B1-1)) This comes out to 12.91% assuming your percentage is normally distributed, then a 95% confidence interval says you should go +/- 1.96 standard errors from the mean 50% - (1.96 * 12.91%) as the lower bound and 50% + (1.96 * 12.91%) as the upper bound (1.96 * 12.91%) = 25.303% so you lower bound formula would be = A1-1.96*sqrt(((100%-A1)*A1)/(B1-1)) your upper bound formula would be = A1+1.96*sqrt(((100%-A1)*A1)/(B1-1)) -- Regards, Tom Ogilvy Heather