Margin Of Error Calculator Confidence Level 90
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Margin Of Error Calculator Sample Size
margin of error?"; "How many people minimum sample size calculator should I interview to have confidence in the study's findings?"Both sample size formula are common questions in marketing research. Below are two calculators to help you answer these http://www.scor.qc.ca/en_calculez.html questions: Margin of error calculator: use it in to calculate the margin of error associated with a sample size Sample size calculator: use it to calculate how many respondents are needed http://www.rmpd.ca/en/calculators.php in order to attain a specific margin of error Don't hesitate to contact one of our consultants to discuss your research needs. ---- CHOOSE A CALCULATOR ----Margin of error calculationSample size calculation Proportion (p): Sample size (n): Population size (N): Confidence level: 90 %95 %99 % Desired margin of error: 1 %3 %5 %10 % Results: Margin of error calculation: Infinite population: Finite population: Sample size calculation: Infinite population: Finite population: Copyright © 2005-2016 RMPD | Home | Contact | Privacy policy and code of conduct Creation de site Internet: Cibaxion
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WorkSocial MediaSoftwareProgrammingWeb Design & DevelopmentBusinessCareersComputers Online Courses B2B Solutions Shop for Books San Francisco, CA Brr, it´s cold outside Search Submit Learn more with dummies Enter your email to join our mailing list for FREE content right to your inbox. Easy! Your email Submit RELATED ARTICLES How to Calculate the Margin of Error for a Sample… Statistics Essentials For Dummies Statistics For Dummies, 2nd Edition SPSS Statistics for Dummies, 3rd Edition Statistics II for Dummies Load more EducationMathStatisticsHow to Calculate the Margin of Error for a Sample Proportion How to Calculate the Margin of Error for a Sample 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 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 Div