The BEST models and zombies on a diet

The t-test is a classical statistical procedure used to compare the means of two data sets. In 2013 John Kruschke developed a souped-up Bayesian version of the t-test he named BEST (standing for Bayesian Estimation Supersedes the t-test). Let's try out BEST as implemented in the BEST package.

Zombies are stupid, but you and your colleagues at the National Zombie Research Laboratory are interested in how diet affects zombie intelligence. You have done a small experiment where you measured the IQ of 10 zombies on a regular diet and 10 zombies on a brain-based diet. The hypothesis is that zombies that eat more brains perform better on IQ tests. To the right, the data from the experiment is put into the variables iq_brains and iq_regular.

Calculate the mean difference in IQ between the two groups by taking the mean of iq_brains minus the mean of iq_regular. Remember that mean(iq_brains) calculates the sample mean of iq_brains.

Take Hint (-7 XP)

Exercise

The BEST models and zombies on a diet

Instructions 1/4