Final aim and hypothesis

My previous aim and hypothesis are as follows:

Aim: To find out if different levels of low-frequency sound waves (ocean noise pollution) emitted by the human's marine activities affect the hatching rate of brine shrimp

Hypothesis: Different levels of low-frequency sound waves (ocean noise pollution) emitted by the human's marine activities affect the hatching rate of brine shrimp

However, I have decided to refine it to make it less of a "yes, no" question but more of one that would allow for greater research. In other words, I would like to change it to a "How" question. Another point is the words "hatching rate". Rate is a rather vague term and does not accurately define what I would like to measure. The dictionary's definition of rate is " A quantity measured with respect to another measured quantity" which is not how I am going about with my experiment. Therefore, I am changing it to "speed".

Therefore, my new aim and hypothesis are as follows:

Aim: To find out how different levels of low-frequency sound waves (ocean noise pollution emitted by human's marine activities) affect the hatching speed of brine shrimp.

Hypothesis: The lower the level of low-frequency sound waves (ocean noise pollution emitted by the human's marine activities), the slower the hatching speed of brine shrimp eggs