As part of a statistics project, a 6th grade teacher brings to class a container with 200 red marbles and 800 white marbles which are thoroughly mixed. To figure out how many marbles in the container are red without actually counting them all, a student randomly draws 150 marbles from the container. Of the 150 marbles drawn, 33 are red.The sampling method used in this example is called
A. random sampling, but not simple random sampling.
B. quota sampling.
C. stratified sampling.
D. simple random sampling.
E. none of these
Answer: D
Mathematics
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Evaluate the integral.
A. 4i - 45j + 
k
B. 2i - 45j + 
k
C. 4i - 45j + 
k
D. 4i + 45j + 
k
Mathematics
Identify the given number as "Rational", "Irrational", or "Not a real number". If the number is rational, give its exact value. If the number is irrational, give a decimal approximation to the nearest thousandth.
A. Irrational, 24.500 B. Rational, 24.500 C. Rational, 7 D. Not a real number
Mathematics
Write a different inequality with the same meaning.x < -10
A. -10 > x B. x ? -10 C. -10 ? x D. x > -10
Mathematics
Find the product. (The expression is not a polynomial, but the formula can still be used.)
?
?
A. 
B. 
C. 
D. 
E. 
Mathematics