A rule of thumb for deciding whether to repair or replace a pump is that if the repair costs more than _____, replace it
A) one fourth the cost of replacing the pump B) the pump originally cost
C) the labor to replace it D) half the cost of replacing the pump
D
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On a bearing that has been shock loaded, the race of the bearing can be dented. This type of bearing failure is called ________
A) Arcing B) Brinelling C) Fluting D) Spalling
Why should Athenian democracy always be qualified as Athenian democracy?
a. It was very different from democracy in Sparta or elsewhere in the Greek world. b. It was the root of all democracy in the modern world. c. It closely resembled the complex and multi-ethnic democracy of modern society. d. It was complex and quite different from democracy today.
What is the difference between step mode testing and continuous mode testing?
What will be an ideal response?
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.