In a large high school, the 25 students who scored highest on an english pretest were placed in a special class. at the end of one semester, they were given another english achievement test. the mean grade-level equivalents were compared for the two tests. this is an example of a
a. one-group pretest-posttest designb. randomized control group pretest-posttest design
c. time series design
d. static group comparison design

One-group pretest-posttest design.

Explanation: A one group pretest-posttest design, is used by researchers to determine the effect of treatment on a particular group. This is done by pretesting a group, modifying or treating the same group and posttesting the group again.

If the results of the pretest and the posttest is significantly different then the difference can be attributed to the modification after the pretest.

the correct labels are as follows:

a: yellow river

b: himalayan mountains

c: north china plain

d: taklimakan desert

answer; automatic fire suppression system;