A2 Biology coursework

Hi everyone

I am stuck in which statistical test to do for my A2 Bio coursework, my experiment is the effect of light wavelength on the rate of photosynthesis but I measured the rate of photosynthesis by measuring water uptake as water is directly linked to it and my school didnt have good enough equipment to measure the volume of released oxygen

I would have liked to have done the chi square test as it will show if light wavelength does actually have an affect on the rate of photosynthesis but by measuring water uptake in an hour, my expected values are less than 1 and I cant even do yeats correction

Please help!!!!