The strength of a relationship between two variables is indicated by the ____ of the correlation coefficient

Which type of research design is the only one that involves the manipulation of independent variables?

If a child repeats the sounds of a word, shows signs of struggle behaviors, or frequently produces a repetition in more than ___ out of 10 words, then this could indicate a stuttering condition

A) 1 B) 2 C) 4 D) 8