Confidence interval tool

Sedgwick P. Understanding confidence intervals. Confidence intervals: predicting uncertainty. What does the p value really mean? British Medical Journal.

Belfast: The Universities Press Ltd; Statistics with confidence:confidence intervals and statistical guidelines. Figura 1. Support Center Support Center. External link. Very oddly, however, it's absent from SPSS. Plenty of reasons for us to present this very simple tool in the remainder of this tutorial. We'll now test our tool on test. This happens to be the case so we'll do just that.

We'll go to U tilities Confidence Interval Proportion and fill out the main dialog as below. Note that TO may be used for a range of variable names. Clicking P aste results in the syntax below. Running our syntax results in a new dataset holding our results. Note that most variables have variable labels explaining their precise meaning. We find back our valid frequencies in these results. Each test variable has in 2 rows, one for each value.

You'll probably need just one of these rows but this configuration circumvents the need for specifying test values for each variable. We simply test both -whatever they may be. Further right we find our z-test. Its p-value indicates the probability of finding the observed sample proportions if its population counterpart is exactly equal to the test proportion. Note that a continuity correction has been used for computing the z-values and their associated p-values. Finally, the last variables in our results hold our confidence intervals and -possibly- some notes on the results.

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National Center for Biotechnology Information , U. Journal List Indian J Surg v. Indian J Surg. Published online Jun Deepti Choudhary and Pankaj Kumar Garg. Author information Article notes Copyright and License information Disclaimer. Corresponding author.

Received Sep 21; Accepted Jun 4. References 1. Prospective randomized controlled trial comparing sub-epididymal orchiectomy versus conventional orchiectomy in metastatic carcinoma of prostate.