Suppose you do find an extraneous variable that could have great influence on your results, beyond the influence of the independent variable. You could increase the experiment's sensitivity by Group of answer choices studying that variable first. exposing half of your participants to the independent variable, and half to the extraneous variable, and comparing the performance of the two groups. incorporating that extraneous variable as a second independent variable. randomly assigning participants to experience either the independent variable or the extraneous variable.

b. 2 and 4

step-by-step explanation:

step-by-step explanation:

your answer is a

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.