since we are talking about squares, and each side in a square has the same length, and all 4 angles are 90 degrees, "similar" did not mean much. every square is similar to every other possible square.
they all are bigger and smaller copies of themselves.
but how much bigger ?
in our case here P is the smaller square and Q the bigger one.
Since the population is normally distributed, the sampling distribution of the sample mean will also be normally distributed, even when the sample size is small.
No such thing as a vertex of a graph... Eliminate B and C. Try f(3) = 4(3-5)(3+3) is not zero eliminate A. So answer must be D. Check: f(-3) has factor -3+3 = 0. f(5) has factor 5-5 = 0.
