The effect of the time of day a science class is taught on test scores is being
studied in an experiment. Giving every student in the experiment the same
final exam is an example of which experimental design principle?

A. Randomization
B. Blocking
C. Direct control
D. Replication

the answer is C. Direct Control

Step-by-step explanation:

giving each student the same test is something being controlled directly by the scientist/reasearcher

can't be randomization as it is not random

can't be replication as nothing is being replicated/duplicated

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

the red lines denote the population of the bacteria after 35 hours. that would be 2,409.24. the y-intercept is the blue line which is 800 because that is the starting point. the equation used to make the graph is 800(1.032)^h, where h is the number of hours.

step-by-step explanation: