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This scatterplot shows: 

What type of validity is of particular concern in an effectiveness study?

When interpreting study results, which is true?

Researchers do not need to know in advance which confounding variables need to be controlled if they use which procedure?

Let Ai={x∈R:−i≤x≤1i}.{“version”:”1.1″,”math”:”A_i=\{x \in \mathbb{R}: -i \leq x \leq \frac{1}{i} \}.”}Find ⋃ i = 1 100 A i {“version”:”1.1″,”math”:”\bigcup_{i=1}^{100}A_i”} 

let A={n: n is an even integer} and B={1,2,3,4,5,6,7,8,9}. Which of the following are elements of B-A? Select all that apply.

Under the assumption that m is a positive integer, compute (7m+9) mod 7

Find (3(8)+4) div 3

Consider the following sentence: If the product of two integers is even, then at least one of those integers must be even. 1) Write that sentence as a logical statement (quantifiers will be involved). You may use standard arithmetical symbols such as multiplication, division, etc. Ensure that your statement is a proposition. 2) Prove the statement from definitions. You may use the fact that every integer is even or odd and never both.  3) Identify that method of proof that you used. 

Write a declaration for a Rectangle named squareShape that is 400 pixels wide, 400 pixels high, and its upper-left corner position is at point (50, 50).