I have 20 colleges with different no. They gather nectar from a population of 560. In social science and educational research, practically it is not possible to a researcher to … The methodology you are using is called cluster sampling combined with random sampling within the clusters. the question will be whay I chose 7 hospitals? a manufacturer would like to survey users to determine the demand potential for its new washing machine. I do not have a reference for the table as I constructed it myself. Cluster sampling is often used to constrain research costs (e.g. For a confidence level of 95% you will need to have 384 data for this instrument to obtain a margin of error of 5%. I have a table but this question has no population how I can answer? In other words, on the smallest district. Your sample may be large enough to have a low margin of error, but not representative for your population (e.g. good day! To be representative, you will need to have respondents from all 4 universities. You can calculate it yourself via this link: http://www.checkmarket.com/market-research-resources/sample-size-calculator/. For margin of error 5% and confidence level 95% this will be 370. Will I get good results. Dear John, first you will need to report your margin of error clearly, so that readers can interpret your results with carefulness. Thank you, If you don’t know the exact size of your population, you will need to make an estimation based on the available info. This sample gives you a margin of error of 9,48% for 95% confidence level, which is quite high. They seem to exist in a very crowded - or densely populated - environment, and in a random configuration. In order to be able to make statements about an agent, you actually have to treat the 600 calls of each agent as a population. Do I have calculate the sample for each strata? I am doing research in asthma. Lecture 7. Furthermore – in contrast with probability sampling – there is no distinct formula to determine the appropriate sample size. Ne = (4*Nm*Nf)/(Nm + Nf) Where: 1. from you b/se explain bestly. study should have adequate p ower and signi ficance [22], allowing the investigators to be confident that the stu dy . However, instantly a new question comes to the forefront: “How many people should my sample consist of?”. However, we are wondering how we can assign (distribute) the sample size to the six sections. and in a second step you can adjust your formula because you know your population: Correction: ss = (ss) / 1 + [(SS – 1) / population]. I have a population of 23,245 from the tables am required to use a sample size of 370, but I want to use 200 as my sample, can you justify a sample of 200 statistically. As a result, this makes the sample a better representation of the population. For instance, if you send out your survey to 400 people and you receive 200 filled in surveys, your response rate is 50%. I am not entirely familiar with this kind of analysis, but I would first try to create several respondent profiles out of the survey using structural equation modelling and second using multinomial logistic regression to link the 4 million people to a corresponding profile. Hello, Please advise in the following scenario. If you do that, you can compare your different populations afterwards. Concluding the number of invites is 894, which is bigger than my population… How is this possible and what should I do? Your sample size should be large enough to get insights in most or all of the perceptions that are important for your research. Hi, i got data of 300 students and my sample size is 80 students, how can i justify this on drug and substance use research projects. So, the optimum would be that z% would be much higher than w%. Only 51 completed. The variation depends on the variation of the population and the size of the sample. Dear sir from your article while explaining the measures that affect the accurateness of the data I really did not get it . SS = (Z-score)² * p*(1-p) / (margin of error)² If you do not know your proportion p, it is quite common to take 0,5 as a value for p. Then you correct it if you know your population: SSadjusted = (SS) / (1 + [(SS – 1) / population]) For your population of 320, confidence level of 95% and margin of error 5% you get the following calculation: SS = (1,96²) * 0,5*0,5 / 0,05² = 384 SSadj. Iwant to ask ideal sample size. I just need to ask if i select a sample of let suppose 600 for any market study.But i don’t know the exact number of population of that particulars with in a country boundary than how to check the representatives and randomness of Sample.. After all, the calculation of the sample is not based on known probabilities and has some subjective judgments (the parameters of the sample depend on what you define as being important). The total of the students is 199 and assuming that I have calculated 66 samples from that number of students. Therefore not much information available on QOL. Do you not have an idea about the total nr. Does anyone know if my company might be able to grab a template a form document to fill in ? I am planning to take a sample of 300 tax payers, 180 employees and 120 Tax practitioners. Finally, I have randomly selected households from each local districts. I want a lirature that I can site in a research which support 10% as sample in a research work. Response rate is the ratio of respondents that fill in the questionnaire they received compared to the total number of surveys you send out. Best Regards. I have a population unknown for which I am going to draw a sample. You can calculate this yourself using our online calculator. Your population is the total number of people in the group you are trying to study. 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 the average satisfaction rate you’re putting both sub populations together, so you’re using just one population (105). You should definitely report these numbers as they will allow the reader of your study to interpret the results. Could I do less than 100 or would I need to find more? i want to know that can i use this formula for my survey as i am going to conduct survey regarding purchase behaviour of customers in four cities of about over 1 lakh population? If so, is it a materially different sample size? gender, age, geographic residence, etc. Kristen, your low response rate is not an issue as you chose to contact a very big population and the higher the population the relatively lower your sample size needs to be. And my proposed sample size is 100,000 within 2 months taking account of the number of branch and the peak hours during lunch time. is the maximum sample size be 384 according to Krejcie & Morgan Table? if so, how? I just stumbled upon this forum and it seems it might save me. Glad to hear I was able to help you! Again each districts have got local districts. So, when you survey a part of the population (your sample), you want the results of your survey to reflect the opinions of the entire population as closely as possible. I have a population size of 16,000. I have to determine the needed sample size for a population of 350 for both the 0.01 and the 0.05 significance levels. 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