As part of a statistics project, a 6th grade teacher brings to class a container with 300 red marbles and 500 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 40 marbles from the container. Of the 40 marbles drawn, 16 are red.The value 16/40 is
A. a parameter.
B. the response rate.
C. the sampling error.
D. the sampling proportion.
E. a statistic.
Answer: E
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Consider the cylinder in ?3. a. Identify the coordinate axis to which the cylinder is parallel. b. Sketch the cylinder.y = 
A. a. Parallel to x-axis;
b. 
B. a. Parallel to y-axis;
b.
C. a. Parallel to x-axis;
b.
D. a. Parallel to x-axis;
b.
Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.y = 6x, y = 12x, y = 6
A. 36? B. 6? C. 12? D. 18?
Solve the problem.The production function f(x, y) for an industrial country was estimated as 
where x is the amount of labor and y the amount of capital. Find the marginal productivity of labor.
A. 8x7y3 B. 14x6y4 C. 4x7y3 D. 7x6y4
If $5,000 is deposited at the end of each half year in an account that earns an annual rate of 6.0% compounded semiannually, how long will it be before the account contains $145,000? Round your answer to two decimal places. ?
A. 8.88 half years B. 53.56 half years C. 45.78 half years D. 35.67 half years E. 21.18 half years