(b) The pon. Before you start sending out your survey to 400 respondents, remember there is such a thing as response rate. How do I calculate the sample for the population? If you want your survey data to reflect very closely the entire population, then you should choose a high confidence level (99%) and a low margin of error (1%). However, at the other end of the spectrum, if you do not mind that your survey results do not entirely reflect the entire population, you can use a ‘low’ confidence level (95%) and a high margin of error (5%). For a smaller margin of error and/or higher confidence level you will need a largere sample. For qualitative research there are no clearly defined statistical rules. If you do not know your proportion p, it is quite common to take 0,5 as a value for p. SS = (Z-score)² * p*(1-p) / (margin of error)² Then you correct it if you know your population: SSadjusted = (SS) / 1 + [(SS – 1) / population], If we use it in an example with a population of 100.000, confidence level of 95% and margin of error 2%, then you get the following calculation: SS = (1,96²) * 0,5*0,5 / 0,02² SS = 3,8416 * 0,25 / 0,0004 SS = 0,9604 / 0,0004 SS = 2401 SSadj. 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Sir, Kindly help me with this problem. or I can select some of them? No, you cannot do that. With a confidence level of 95% and margin of error of 5% the ideal sample size is 92. You can use our sample size calculator to estimate your required sample size. You can very easily calculate backwards using our sample size calculator. You can check with our sample size calculator, I have population known that is 150 with the sample of 30 how can i calculate the population size and sample size. For most professional and academic demographic purposes, though, you'll need to use the standard square miles or kilometers. Hi Didier, I have a 387 respondents reported data from a total population of 4730. I mean, if you want to validate a new questionnaire (Q) by a gold standard one, and let assume that you want to examine how well the new Q estimates the mean value of a variable of interest (compared to the mean as obtained from the gold standard Q). from this population what will be the recommended sample size. Thank you for your interesting questions. Those will give you an idea of which variables to use. Using the table from the article, this would mean that you need at least 16.000 respondents. If you only distribute your questionnaire in one institution, your sample will not be representative for your total population. To learn more, visit our Earning Credit Page. The frog population grows exponentially, tripling every 5 days. Festival of Sacrifice: The Past and Present of the Islamic Holiday of Eid al-Adha. This depends on the definition of your population, which is based on the objective of your study. This gives us more information than stating the exact population growth for the entire time period, and allows us to better predict future years of growth or decline for the population. Please I meant to ask that, can I administer my questionnaire at the offices of the DVLA in only one region? Dear Passa, please use this calculator: https://www.checkmarket.com/market-research-resources/sample-size-calculator/. Based on this limited information, it is rather difficult for me to answer your questions. If you know the population size for each of your strata, you can use our sample size calculator to calculate sample sizes for a 95% confidence level. I have 179 household and I want to make a satisfaction survey. Does this compare well with your sample? with the distribution in the population. The maximum sample size in their table is indeed 384 (using a 95% confidence level and margin of error of 5%). Agricultural density is calculated by determining the area of arable (farmable) land divided by the number of farmers in that region. I am surveying a 430 population on a 38-items questionnaire. from 6 families children, family one = 1 child, family two = 2 children, family three = 3 children, family four = 4 children, family five = 5 children, and family 6 = 4 children.
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