The answer to this question is that the period is 6*pi/5. The period of y = sin(bx) is given by
period = 2pi/b
so with b = 3/5, that is the result.
A scatter plot is used to determine whether there is a relationship or not between paired data.
y tends to decrease as x increases, x and y are said to have a negative correlation
However, the points shown cannot be modeled with a linear function reliably.
3/8 is 0.375, which is bigger than 0.3, so 3/8 is larger.