Roselyn is a social work researcher who is planning to study the outcomes of educational initiatives. She wants to compare students who are involved with the new initiatives with those who are in traditional programming. Her sampling procedure consists on first obtaining a random sample of schools, and then obtaining a random sample of classrooms within the selected schools. Finally, she will randomly select five children from each classroom. What type of sampling approach is she using

irrational, cannot

when rotating a figure 180 degrees, imagine that you are able to take the figure and turn it clockwise or counterclockwise around a center point. to rotate a figure 180 degrees, you will need to apply the rule (x, y) → (-x, -y). start by using a coordinate grid with coordinates for each vertex of the figure. the center point of the coordinate grid is located at (0, 0), which is what you will rotate the figure around. write down the original coordinates of the shape you are going to rotate. then, apply the rule. for example, coordinate (1, 2) becomes (-1, -2). another example would be, coordinate (-4, -2) becoming (4, 2). after you change each original coordinate to the rotated coordinate, you will draw your new figure.

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191 students play sports and ninety-seven 10th graders were surveyed.

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