Confidence Interval Limits Margin Error
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limits to how to find margin of error with confidence interval find the point estimate and the margin of error for the margin of error vs confidence interval equation: 0.772 is less than p and p is less than 0.776 Log On Ad: Mathway solves
Margin Of Error Confidence Interval Proportion
algebra homework problems with step-by-step help! Algebra: Probability and statisticsSection SolversSolvers LessonsLessons Answers archiveAnswers Immediate math help from PAID TUTORS. (paid link) Click here to see ALL problems on Probability-and-statistics Question 507430: use the
Margin Of Error Confidence Interval Ti 83
given confidence interval limits to find the point estimate and the margin of error for the equation: 0.772 is less than p and p is less than 0.776 Answer by stanbon(72812) (Show Source): You can put this solution on YOUR website! use the given confidence interval limits to find the point estimate and the margin of error for the equation: 0.772 is less than p and p is less than 0.776 ----------------------- The point estimate is the average of the confidence interval limits: ---- p-hat = (0.772+0.776)/2 = 0.774 ------ Margin of Error = 0.776-0.774 = 0.002 =============== Cheers, Stan H. ===============
test AP formulas FAQ AP study guides AP calculators Binomial Chi-square f Dist Hypergeometric Multinomial Negative binomial Normal Poisson t Dist Random numbers Probability Bayes rule Combinations/permutations Factorial Event counter Wizard Graphing find the margin of error for a 95 confidence interval Scientific Financial Calculator books AP calculator review Statistics AP study guides Probability Survey
Margin Of Error Confidence Interval Formula
sampling Excel Graphing calculators Book reviews Glossary AP practice exam Problems and solutions Formulas Notation Share with Friends margin of error confidence interval equation Margin of Error In a confidence interval, the range of values above and below the sample statistic is called the margin of error. For example, suppose we wanted to know the percentage http://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.507430.html of adults that exercise daily. We could devise a sample design to ensure that our sample estimate will not differ from the true population value by more than, say, 5 percent (the margin of error) 90 percent of the time (the confidence level). How to Compute the Margin of Error The margin of error can be defined by either of the following equations. Margin of http://stattrek.com/estimation/margin-of-error.aspx error = Critical value x Standard deviation of the statistic Margin of error = Critical value x Standard error of the statistic If you know the standard deviation of the statistic, use the first equation to compute the margin of error. Otherwise, use the second equation. Previously, we described how to compute the standard deviation and standard error. How to Find the Critical Value The critical value is a factor used to compute the margin of error. This section describes how to find the critical value, when the sampling distribution of the statistic is normal or nearly normal. The central limit theorem states that the sampling distribution of a statistic will be nearly normal, if the sample size is large enough. As a rough guide, many statisticians say that a sample size of 30 is large enough when the population distribution is bell-shaped. But if the original population is badly skewed, has multiple peaks, and/or has outliers, researchers like the sample size to be even larger. When the sampling distribution is nearly normal, the critical value can be expressed as a t score or as a z score. When the sample size i
Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies http://stats.stackexchange.com/questions/21854/interpreting-a-negative-confidence-limit-for-a-proportion of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Cross Validated Questions Tags Users Badges Unanswered Ask Question _ Cross Validated is a question and answer site for people interested in statistics, machine learning, data analysis, data mining, and data visualization. Join them; it only takes a minute: confidence interval Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Interpreting a negative confidence limit for a proportion up vote 3 down vote favorite 2 The margin of error is driven by the size of the sample. In a consultant's report (which is confidential at this stage), they margin of error collected responses from 10 store managers (out of a total of 200 store managers i.e. target population) and went on to make statements such as "only 20% of the respondents were happy with the sales performance of their stores". The margin of error in this case is around 32%. Assuming a confidence level of 95%, the true response is between -12 and 52%. How does one interpret this result (especially the negative part)? It is wise to use margin of error for small sample sizes (e.g. sample of 15 out of a target population of 60)? confidence-interval sampling share|improve this question edited Jan 31 '12 at 7:34 Peter Ellis 13k12166 asked Jan 28 '12 at 6:36 Adhesh Josh 91283356 1 The title strikes me as slightly misleading. The question is definitely not what I expected when I first clicked on the link. –cardinal♦ Jan 28 '12 at 21:14 @cardinal I edited the title to be more accurate. –whuber♦ Jan 29 '12 at 0:59 I alawys thought confidence interval and margin of error refered to the same concept! Is there a difference? &ndash
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