what academic writing that tells what the project is all about, the reasons of conducting the project as well of carrying it out?

Answer. Explanation: A concept paper is a document which summarizes what your project is about, why it is important, and how you intend to carry it out.

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answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."