Use the guidelines to evaluate the study. From the information given, what is the biggest flaw in the study?An educational researcher wishes to compare the effectiveness of two different math textbooks. She has the tenth graders at one school use the first book for one year and the tenth graders at another school use the second textbook for one year. At the end of the year, she gives the same math test to both classes and compares the results.
A. Participation bias
B. Selection bias
C. Confounding variables
D. The source
E. The setting
Answer: C
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Provide an appropriate response.Which of the following express 1 + 5 + 25 + 125 + 625 in sigma notation? I.
II.
III.
A. I and II B. I, II, and III C. II and III D. II only
Find an equation of variation if the following conditions exist.Suppose m varies directly as p and m = 63 when p = 7.
A. m = 
p
B. m = 56p
C. m = 70p
D. m = 9p
Graph the function f(x) over the given interval. Partition the interval into 4 subintervals of equal length. Then add to your sketch the rectangles associated with the Riemann sum 
, using the indicated point in the kth subinterval for ck.f(x) = x2 - 2, [0, 8], midpoint
A. 
B. 
C. 
D. 
Use the accompanying graph of y = f(x) to sketch the graph of the indicated function.y = - f(2x)
A. 
B. 
C. 
D. 