Confidence Interval To Find Estimated Margin Of Error
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Use Confidence Interval To Find Margin Of Error And Sample Mean
the Margin of Error for a Sample… Statistics Essentials For Dummies Statistics For Dummies, 2nd Edition SPSS Statistics for
Given Confidence Interval Find Margin Of Error
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Margin Of Error Formula
Proportion Related Book Statistics For Dummies, 2nd Edition By Deborah J. Rumsey When you report the results of a statistical survey, you need to include the margin of error. The general formula for the margin of error for a sample proportion (if certain conditions are met) is where is the sample proportion, n is the sample size, and z* is how to find margin of error on calculator the appropriate z*-value for your desired level of confidence (from the following table). z*-Values for Selected (Percentage) Confidence Levels Percentage Confidence z*-Value 80 1.28 90 1.645 95 1.96 98 2.33 99 2.58 Note that these values are taken from the standard normal (Z-) distribution. The area between each z* value and the negative of that z* value is the confidence percentage (approximately). For example, the area between z*=1.28 and z=-1.28 is approximately 0.80. Hence this chart can be expanded to other confidence percentages as well. The chart shows only the confidence percentages most commonly used. Here are the steps for calculating the margin of error for a sample proportion: Find the sample size, n, and the sample proportion. The sample proportion is the number in the sample with the characteristic of interest, divided by n. Multiply the sample proportion by Divide the result by n. Take the square root of the calculated value. You now have the standard error, Multiply the result by the appropriate z*-value for the confidence level desired. Refer to the above table for the appropriate z
Size = 9 - 1Interval Size = 8Calculate the margin of http://www.mathcelebrity.com/search.php?q=margin%20of%20error%20for%201%2C9 error:Margin of Error=±Interval Size2Margin of Error=±82Margin of Error = ±4Calculate sample mean:The sample mean is just the midpoint of the confidence intervalSample Mean x=Interval Size2Sample Mean x=9 + 12Sample Mean x=102Sample Mean x = 5 Email: don@mathcelebrity.com Tel: (708) 926-4171 MembershipExam CertificationsHomework HelpFree Traffic Secrets CourseSubjectsPrivacy Policy
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