The 2.2 version of rSim for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The program belongs to Education Tools. This free Mac application was originally designed by Marley Watkins.
From the developer:
rSim is a free-to-use standalone Macintosh program that interactively simulates how the 95% confidence interval and statistical significance (p ≠ 0) of the correlation coefficient vary as a function of sample size. This program has an intuitive interface.
You may want to check out more software for Mac, such as eduMap, FRS Money Math or FRS Clocks and Time, which might be related to rSim.