A sample of n = 9 participants is obtained from a population with participants are as follows : 23 , 33 26 , 28 , 30 , 26 , 27 , 25 , 25 and a treatment is administered to the individuals in the sample . After treatment , the scores for the nine a Are the data sufficient to conclude that the treatment has a significant effect ? Use a two - tailed test with a SO^ prime =Y . Are the data sufficient to conclude that the treatment significantly decreased scores ? Use a one - tailed test with a = .

Use 2 tailed test with SO

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.