How To Determine Sample Size For Unknown Population

Determination of sample size over the history of research project writing has been one of the nearly important tools for constructive data assay. There are so many ways to determine sample size. The most mutual method used by inquiry project students who desire to appoint project writing is the Taro Yamane formula for known population. But in this article I volition focus on the conclusion of reliable sample size for unknown population. The sample size is usually required for projection topics nether social sciences that involved primary data.

        When I say primary information I mean raw information gotten from a particular source; here the master data are gotten directly from the responses of the respondents either through the utilize of questionnaires or interview. In the next article I volition show undergraduate projection students and post graduate project students on how to grade questionnaires for different kind of responses.

        Earlier I explain how to use the z score for the determination of reliable sample size for unknown population permit me first of all explain the z score. A Z-score is a numerical measurement used in statistics of a value's relationship to the mean (boilerplate) of a group of values, measured in terms of standard deviations from the mean. If a Z-score is 0, it indicates that the data point'southward score is identical to the mean score.

        The Z score can be used to determine the reliable sample size by because normal derivation set up at 95% conviction level (1.96). So we pick a choice or response (50%=0.v) and the confidence interval (0.05 = ± 5) using the formula below:

due north = Z2 (P) (1-P)/C2

Where

Z= standard normal deviation gear up at 95% confidence level

P = percentage picking a choice or response

C= confidence interval

n = (1.96)2 (0.five) (one-0.5)/ (0.05)2

n = (3.8416)(0.5)(0.5)/0.0025

north = 0.9604/0.0025

n ≈ 384.16

n = 384

The sample size for the written report will be 384. The sample size can all the same change depending on what confidence level y'all desire to choose. An undergraduate project pupil can practice this method trying different confidence level.

The formula is flexible; when you lot already have the sample size, you lot can determine the standard normal deviation set at 95% conviction level and also the p-value which is the percentage picking or pick of response. The same goes to finding the confidence interval.

Published: Sunday, 04 Baronial 2019 | Author: ProjectRegards Admin | Tags: education project topics, accounting project topics | Views: 17,591

How To Determine Sample Size For Unknown Population,

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