A scientist wanted to find out if runners finished a race faster if they ate
beforehand. The scientist had four runners eat a meal and then complete a
race. A few days later, the scientist had the runners complete the same race
without eating. What is the best way for the scientist to analyze the data he
collected?

the best way for him to collect the data is that make one group control group and then other with eating too much or not eating at all.

control group should be: eating enough like not too much not less.

Explanation:

( love to help) :)

b) the inside picture would look at a very high temperature in a very low ph

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.