Quarts-would be the correct answer <span />
Answer:

Step-by-step explanation:

Hope this helped!
<h2>~AnonymousHelper1807</h2>
Answer:
He will be unable to tell whether a difference in exercise preference is related to a difference in age or to a difference in weight
Step-by-step explanation:
age could be a factor to exercise as well as weight so both affect the outcome so he has two samples
Bearing in mind that

I can make this much from that, check the picture below.