Use the guidelines to evaluate the study. From the information given, what is the biggest flaw in the study?A medical researcher randomly selects 500 Japanese people and 500 Americans. She questions the 1000 people. She finds that the Americans work longer hours on average and also that the Americans have a higher rate of heart disease. She concludes that working longer hours is associated with a higher incidence of heart disease.
A. Participation bias
B. Selection bias
C. The source
D. Variables are hard to define/measure
E. Confounding variables
Answer: E
Mathematics
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Find the domain of the logarithmic function.g(x) = log7(4 - 4x)
A. (-?, 4)
B. (7, ?)
C. 
D. 
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Solve.16x2 + 64y2 = 10248y + 4x = 32
A. (0, -8), (0, -4) B. (0, 8), (4, 0) C. (0, 4), (8,0) D. (0, -4), (-8, 0)
Mathematics
Write the number in standard form.92 ? 103
A. 540 B. 81,000 C. 1081 D. 5.31441e+11
Mathematics
For problems 3-15, use guess and check or the 
method to completely factor each polynomial. If the polynomial is prime, indicate that fact.
A. 
B. 
C. 
D. prime
E. none of these
Mathematics