Jason is interested in the topic of perception. He has participants complete a task on a computer and measures reaction and number of errors. Jason is thinking of repeating this task after the participants have been exposed to the independent variable. Which of the following reasons bests describes why Jason might not want to have participants complete the task again?

a. ethical concernsb. more statistical variancec. practice effectsd. none of the above

3. parallelogram

step-by-step explanation:

we turn each of our sides into direction vectors

ab=b-a=(3 - 7, 1 - 0) = (-4, 1)

bc=c-b=(1,6)

cd=d-c=(4,-1)

da=a-d=(-1,-6)

we see how the opposite sides have negated direction vectors; this is characteristic of a parallelogram.   we have congruent sides ab=cd and bc=da with unequal lengths because 1^2+6^2 is different from (-4)^2+1^2.   so it's not a square or a rhombus.  

we check the dot product of direction vectors of adjacent sides.   we have

ab dot bc = -4(1) + 1(6) = 2

that's not zero so the sides are not perpendicular.   we've ruled out rectangle.

the direction vectors indicate two pairs of congruent parallel sides, so we choose parallelogram over trapezoid.

the answer is true.

step-by-step explanation:

c

step-by-step explanation:

c

answer: 2/4

step-by-step explanation: