Question

A researcher finds that white bread contains more preservatives and has a higher moisture content than wheat bread. She designs a test to determine whether the type of bread, white or wheat, affects the amount of mold growth. What must be done for the researcher to accurately measure the dependent variable?
A. She will need to allow mold to grow for more days on the white bread, since it contains more preservatives, to measure the dependent variable.
B. She will need to limit the dependent variable to white bread or wheat bread.
C. She will need to allow mold to grow for fewer days on the white bread, since it contains more preservatives, to measure the dependent variable.
D. She will need to learn out how to quantitatively measure mold growth to measure the dependent variable.

(I put 99 points on this; and you'll receive brainliest).

Answer 1

D.

is correct on edg.

Answer 2

For the researcher to accurately measure the dependent variable [which is quantity of mold growth produced] she will need to learn how to quantitatively measure mold growth. The correct option is D. Since the researcher has decided to measure the quantity of mold growth produced by both white and wheat bread, she must devise an effective and accurate mean of measuring the quantity of growth produced by the breads, this will enable her to subject the two breads to the same experimental conditions.