Astudy to evaluate the effectiveness of computer-assisted instruction in reading compared two groups, one using the computers, the other not using them. the researchers first tested the students for "reading readiness" and insured that the average readiness scores of students in the two groups was the same. the design used here was a two-level design.

a. independent groups designb. matched groups designc. nonequivalent groups designd. repeated measures design

B. Matched groups design

Explanation:

In matched group design, subjects are matched on specific variables such as reading readiness score in this case which may affect the outcome of the dependent variables such as effectiveness of computer-assisted instruction in reading and then the subjects are split into the test groups. This is just to reduce errors in the study.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.

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