The effect of the time of day a science class is taught on test scores is being studied in an experiment. dividing the students in the experiment into groups based on who teaches their science class is an example of which experimental design principle?
a. direct control
b. randomization
c. replication
d. blocking

Abc will undergo two transformations to give aa'b'c' which pair of transformations will give a different image of aabc if the order of the transformations is reversed? a. a rotation 90' counterclockwise about the origin followed by a reflection across the y-axis b a translation 5 units down followed by a translation 4 units to the right c. a reflection across the x-axis followed by a reflection across the y-axis a rotation 180'clockwise about the ongin followed by a reflection across the y-axis reset next 2 omentum all rights reserved o atk me anything o o e