What are the advantages and disadvantages of a CNG powered vehicle?
What will be an ideal response?
Advantages are: cleanest burning, 130 octane, readily available, can be used as a bifuel, available OE directly from some vehicle manufacturers. Disadvantages are: high pressure storage tank, needs a larger size tank for a farther range.
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Plasma makes up about _______ of the blood.
A. 25% B. 35% C. 45% D. 55%
____ wire means the conductor is made of several individual wires that are wrapped together.
A. Stranded B. Copper C. Primary D. Secondary
A medical researcher wants to determine whether exercising can lower blood pressure. She recruits 100 people with high blood pressure to participate in the study. She assigns a random sample of 50 of them to pursue an exercise program that includes daily swimming and jogging. She assigns the other 50 to refrain from vigorous activity. She measures the blood pressure of each of the 100 individuals both before and after the study.
a. Is this a controlled experiment or an observational study? b. On the average, the subjects in the exercise group substantially reduced their blood pressure, while the subjects in the no-exercise group did not experience a reduction. The researcher concludes that exercise decreases blood pressure. Is this conclusion better justified than the conclusion in Exercise 8? Explain.
If x[n] = n2(u [n] ? u [n ? 3] ) 
what is the value of 
What will be an ideal response?