one of the reviewer of a paper of mine suggested to perform a homoscedasticity test between the results of two experiments, testing the same thing in two conditions. The experiments consisted in ratings along a 7 points Likert-scale. One of the experiment results were distributed on a large range of values, while the other showed a tendency towards the center of the Likert-scale range (i.e. 3.5). The reviewer argued that the latter behaviour could be due to the fact that participants answered more randomly, and he suggested that to verify this possibility, an homoscedasticity test should be performed comparing the two conditions.
Now, I would like to understand this comment. In relation to my case, what does it mean that the variances of the two conditions are significantly different? What instead if they are equal?
Secondly and more importantly, which test for homoscedasticity do you suggest I perform? I use R. Can you suggest the function more suitable for my case? I saw that there are many.