Answer the question.Which of the following describes the bias that can occur when members of a study's sample are volunteers?
A. Single-blind bias
B. Participation bias
C. Sample bias
D. Selection bias
Answer: B
Mathematics
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Identify the equation without applying a rotation of axes.3x2 + 3xy + 2y2 + 2x + 2y - 7 = 0
A. parabola B. hyperbola C. ellipse D. circle
Mathematics
Determine the center (or vertex if the curve is a parabola) of the given curve.9y2 + 16x2 + 72y = 0
A. (0, -4) B. (-3, 0) C. (0, 4) D. (3, 0)
Mathematics
Multiply.(5b2 + 2)(5b2 - 2)
A. 25b4 + 4 B. 10b4 - 4 C. 25b4 - 4 D. 10b4 + 4
Mathematics
Use synthetic division to decide whether the given number is a solution of the given equation.-3x4 - 10x3 + 4x + 1; x = - 
A. Yes B. No
Mathematics