Where s 1 and s 2 are the standard deviations of the two samples with sample sizes n 1 and n 2. The program first calculates the pooled standard deviation s: Sample size: the number of observations in the sample.Standard deviation: the observed standard deviation.The null hypothesis is the hypothesis that the difference is 0. The P-value is the probability of obtaining the observed difference between the samples if the null hypothesis were true. A significance value (P-value) and 95% Confidence Interval (CI) of the difference is reported. The software will only retrieve the most recent version number from the website and compare it with the version number of your MedCalc copy.This procedure calculates the difference between the observed means in two independent samples. When MedCalc checks for updates, no personal information (name, product key) is being sent to the MedCalc web server. When the update could successfully be downloaded, the update software is launched automatically. You can interrupt and cancel the download by clicking the Cancel button. If you click Update, the update will be downloaded from the MedCalc website: You can always re-enable this option in MedCalc's Options dialog box. If you do not want MedCalc to automatically check for updates in the future, select the option Do not check for MedCalc updates in the future. If you don't want to install the update, click Cancel and MedCalc will remind you of the update after a user-defined number of days (see Options). MedCalc updates are free of charge and updating to the latest version is always recommended. When the program can successfully connect to the MedCalc website, and an update is available, the following dialog box is displayed: When you start MedCalc, the program will check whether a new version of the software is available from the MedCalc website. Important: the auto-update feature is only available if you have a legal, non-network MedCalc license.
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