Two teachers who are friends teach math at different high schools. at a conference, they learn about a new program for teaching trigonometry. they decide to test it by having one teacher use it in her class and the other use the traditional program, then compare their students' scores on the ap trigonometry test. this is an example of which experimental design?

The experimental design is called Between Subjects Design or Independet Measure.

Explanation:

In the experimental design "Independet Measures" you have different groups. Each group is tested under certain conditions whereas a member of one group cannot be part of another group. A commonly known case were this experimental design is used is drug testing. One group is given the medication whereas the other group receives the placebo.

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.