Astudent researcher conducts an experiment that investigates the effects of
a new textbook on student achievement. two intact classrooms are used for
the samples. one classroom is taught with the new textbook and the other is
taught with the traditional textbook. each sample consists of 30 students.
observations of student engagement are rated by the researcher, according
to an engagement scale. how could this study be improved?
select all that apply.
d
a. randomly assign students to two different groups.
o
b. administer an instrument, gauging student understanding.
o
c. restrict the study to one group - the one taught with the new
textbook.
o
d. have another researcher rate the observations, as well.

solution:

we have to construct

∠m nt ≅ ∠p qr

the steps to draw this construction are

step 1: use a compass to draw an arc from point q which intersects the side pq at point a and the side qr at point b.

step 2: draw a segment nt and use the same width of the compass to draw an arc from point n which intersects the segment nt at a point x.

step 3:

step 4: join points n and y using a straightedge.

step 3:

option (d).maintaining the same width of the compass as ab, draw an arc from point x such that it intersects the arc drawn from n in a point y.

to draw   congruent angles , 1. width of compasses while drawing two angles should be same i.e from point at which angle has to be drawn, 2.the distance between the two points where the compass intersects the two sides should be same while drawing any two congruent angles.

answer: i ! the answer is   9000 seconds, also d

hope i

-lavira : )

yes they are the same