# Sample Size Population Margin Of Error

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Your population is **defined by the** number of potential respondents in your target group. Gert Van Dessel - October, 2015 reply Buchara,In many researches it is standard to permit a maximum margin of error of 5% but of course you can make this stricter if When estimating a mean score or a proportion from a single sample, DF is equal to the sample size minus one. I am conducting a descriptive research, I Have 473 total population of respondents.what would be the sample size needed in my study? http://onlivetalk.com/sample-size/sample-size-based-on-population-and-margin-of-error.php

In the 2nd **case, how many cutomers are** there approximately per bank/in total? diane - September, 2015 reply how about for the sample size of a 120 population only? Reply RickPenwarden says: March 4, 2015 at 11:13 am Hey Shanks! I have worked out that my population size for the location I want to target is 3,600.Based on a margin of error of 5% and a confidence level of 95% I navigate to these guys

## Sample Size Table

Anyhow, I have two questions about the number of population within my research. Nida. The smaller your error margin, the better of course.

You can always check with our sample size calculator Karol - June, 2016 Thanks a lot Gert! Though your case isn't technically random sampling, since every person has a chance to answer the survey, your project still falls under probability sampling, meaning the calculator can still be used. What is the response distribution? Sample Size Calculator Power Let's say that you have an average of 30 patients per day, then your monthly population will be 900.

Suppose that you have 20 yes-no questions in your survey. Sample Size Formula Non-random samples usually result from some flaw in the sampling procedure. ijeoma Mary - July, 2016 reply Good day Gert Van Desssel. click for more info Determining the Required Sample Size If the desired margin of error E is specified and the desired confidence level is specified, the required sample size to meet the requirement can be

To express the critical value as a t statistic, follow these steps. Sample Size In Research Reply RickPenwarden says: December 5, 2014 at 11:27 am Hi aj, Your desired margin of error and confidence level has nothing to do with your population size. I have to answer the questions my professor ask me are, " how well you think your sample represents your populations? Must I put low condidence level and high margin of error?

## Sample Size Formula

The lower your sample size, the higher your margin of error and lower your confidence level. http://www.robertniles.com/stats/margin.shtml i would conduct my study at shopping malls, which is unknown population. Sample Size Table How do you like this web page? Sample Size Calculator Online and how many patients per hospital?

Tessy - July, 2016 Hi Gert, Im currently studying on UK working class. http://onlivetalk.com/sample-size/sample-size-for-10-margin-of-error.php Because if my sample is not probabilistic the margin error and confidence level have no importance and will be able to make a analysis based on the 115 answers collected. So let's say I conducted a staff survey in 2012 and had a population of 65 people, but in 2013 when the report came out our population was 85. Reply Liz says: November 3, 2014 at 9:46 am Hi - in your example (satisfaction on a scale of 1-10) is the average of 8.6 a weighted average? Minimum Sample Size Calculator

Tq Gert Van Dessel - September, 2016 reply Sherli,You can use our sample size calculator to estimate your required sample size. Now that we know how both margins of error and confidence levels affect the accuracy of results, let’s take a look at what happens when the sample size changes. Could u plz tell me how to determine sample size if don't give any information (standard deviation and confidence interval). http://onlivetalk.com/sample-size/sample-size-increases-margin-error-confidence-interval-population-proportion.php How to determine the required sample size by using a formula.

Check Out Our Survey Sample Size Calculator Right Now! Margin Of Error Formula You can do this yourself with the second part of our sample size calculator. This simple question is a never-ending quandary for researchers.

## Which is mathematical jargon for..."Trust me.

If you have an indication about that, you can use our sample size calculator to calculate your sample for a given confidence level and margin of error you want to accept. You can use it to determine how many people you need to interview in order to get results that reflect the target population as precisely as needed. Generally a margin of error of 5% is taken as maximum. How To Calculate Sample Size In Statistics The mathematics of probability proves the size of the population is irrelevant unless the size of the sample exceeds a few percent of the total population you are examining.

I have 1 question: I want to conduct research that focuses on why young engineering graduates are leaving careers in a specific engineering discipline in favor of others. Next, we find the standard error of the mean, using the following equation: SEx = s / sqrt( n ) = 0.4 / sqrt( 900 ) = 0.4 / 30 = Remember that your population consist of approximately 400 million adults in the EU. http://onlivetalk.com/sample-size/sample-size-margin-error.php Often you may not know the exact population size.

Since we cannot sample a portion of a subject - e.g. Please download and reuse this web page! Reporters throw it around like a hot potato -- like if they linger with it too long (say, by trying to explain what it means), they'll just get burned. But if you wanted to get more precise you can shrink your margin of error to be 2.5%.

face-2-face interviews or focus groups), you don't need a minimmum sample size to get valid research. Let’s say we own a magazine with 1000 subscribers and we want to measure their satisfaction. Keith - March, 2016 What formula should I use then? See table below How many individuals to choose by region for his study?

IS this right? The number of questions has nothing to do with selecting a sample size that will achieve your desired level of confidence and margin of error. Maarten Marijnissen - October, 2016 Hi Fiona,Below you find the formula for calculating your sample size for an unknown population:First you calculate the sample size (SS). You can also find the level of precision you have in an existing sample.

Thanks Reply RickPenwarden says: May 25, 2015 at 2:10 pm Hello Panos! a 40% response rate) then we would need to sample (\frac{7745}{0.4})=19,362.5 or 19,363. Gert Van Dessel - July, 2015 reply Alice,With a sample of 300 for a population of 390,000 your margin of e Resources Support Online Help 1-800-340-9194 Contact Support Login Toggle navigation who like blue best?

Now, remember that the size of the entire population doesn't matter when you're measuring the accuracy of polls. It's always great to check your work and not just blindly trust a survey sample size calculator you find on the internet. Alternate scenarios With a sample size of With a confidence level of Your margin of error would be 9.78% 6.89% 5.62% Your sample size would need to be 267 377 643 If the sample is skewed highly one way or the other,the population probably is, too.

Common sense will tell you (if you listen...) that the chance that your sample is off the mark will decrease as you add more people to your sample. I used 95% confidence and a margin of error of 5%- the calculation shows about 152. This means if for instance 60% of your sample selects a certain answer option, the actual percentage for your population will be between 44% (60-16) and 76% (60+16). The only reason not to use your entire population in your sample size would be due to your own lack of resources or inability to reach potential respondents.