Aresearcher wishes to compare how students at two different schools perform on a math test. he randomly selects 40 students form each of the schools and obtains their test scores. he pairs the first score from school a with the first score from school b, the second score from school a with the second score from school b and so on. he then performs a hypothesis test for matched pairs.

a.) is this approach valid? why or why not

b.) if it is not a valid approach, how should the researcher have proceeded?

Polygons efgh and e′f′g′h′ are shown on the coordinate grid: what set of transformations is performed on efgh to form e′f′g′h′? a. a translation 1 unit to the left followed by a 90-degree counterclockwise rotation about the origin b. a translation 1 unit to the right followed by a 90-degree counterclockwise rotation about the origin c. a 90-degree clockwise rotation about the origin followed by a translation 2 units to the right d. a 90-degree clockwise rotation about the origin followed by a translation 2 units to the left

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota