Click here for more information. Trouble Downloading? William Kennedy , Consultant. With all the procedures that you need for research or to make a good, informative presentation, it can be used for teaching in a university. Here in Idesem-Chile we have found it to be the best tool to support our measurement activities. I recommend this tool to make your job more enjoyable! For the following, it is assumed that there is a population of individuals where some proportion, p , of the population is distinguishable from the other 1-p in some way; e.
For an explanation of why the sample estimate is normally distributed, study the Central Limit Theorem. As defined below, confidence level, confidence intervals, and sample sizes are all calculated with respect to this sampling distribution. The confidence level gives just how "likely" this is — e.
The confidence level is a measure of certainty regarding how accurately a sample reflects the population being studied within a chosen confidence interval. Note that using z-scores assumes that the sampling distribution is normally distributed, as described above in "Statistics of a Random Sample.
Once an interval is calculated, it either contains or does not contain the population parameter of interest. The wider the confidence interval you are willing to accept, the more certain you can be that the whole population answers would be within that range. There are three factors that determine the size of the confidence interval for a given confidence level:.
The larger your sample size, the more sure you can be that their answers truly reflect the population. This indicates that for a given confidence level, the larger your sample size, the smaller your confidence interval. However, the relationship is not linear i. Your accuracy also depends on the percentage of your sample that picks a particular answer.
It is easier to be sure of extreme answers than of middle-of-the-road ones. You should also use this percentage if you want to determine a general level of accuracy for a sample you already have. To determine the confidence interval for a specific answer your sample has given, you can use the percentage picking that answer and get a smaller interval. How many people are there in the group your sample represents? Check on a procedure button in the main display areas to load the procedure Input the analysis parameters on the procedure window.
Click the calculate button on the procedure window to perform the calculation and view the results in the output window. Enjoyed Our Article? Subscribe to our mailing list Your Privacy is paramount! We only send weekly Research Related Articles to You.
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