Chiquared Test Hi I had a previous question answered here He

Chiquared Test

Hi, I had a previous question answered here. Here\'s the data for that:

http://imgur.com/a/PiMbF

I\'m actually wondering how to prove whether an inhibitor worked or not. If it works, the cells won\'t move and there should be an even amount of cells in light and in darkness. In the control, the cells CAN move, so most are going to move towards the light (this is what these cells prefer). I\'m not testing to prove a relationship between light and movement - this is already a given. Maybe this can\'t be done using chisquared? I\'ve no experience with statistics, not sure why we\'re even asked to do all this. So thanks.

Solution

If inhibitor does not work, proportion would cells in light would be 0.5, and we can test if sample proportion is significantly different from 0.5

In this answer, the researcher was interested in whether or not the effects of two inhibitors are same. This is same as testing if there is an association between inhibitor type and light/darkness.