Vol. 6, Issue 2 (2019)
The effect of standard error and population proportion in sample size determination
Author(s): Mohammed Omer A Mohammed, Adil MY waniss, Afra Hashim
Abstract: The aim of this study was to determine the sample size using simple random sampling techniques. Test from two tails was used at the level of significant, and value of test with Standard error ranging from (0.001 to 0.02), and value of proportions ranging from (0.12 to 0.5). Excel office and SPSS package were applied for sample size generation and analysis. The results showed that, the sample size increases as, the standard error decreases with a normal curve in all values, except in three cases where the standard error values were too small (0.001, 0.002 and 0.003). The three cases showed very large sample size compared with the other values. As a conclusion it was found that, sample size decreases as, the proportion decreases. The analysis of results showed significant correlation between sample size () and standard error (e), and there is significant difference between sample sizes obtained from one tail and two tails.