Four questions. Every miss becomes a line in your plan.
A team of ecologists hypothesized that city pigeons roost on office buildings primarily to absorb heat escaping from the buildings. However, thermal surveys conducted over an entire winter found large numbers of pigeons roosting nightly on several abandoned buildings that emitted no heat at all. The ecologists' hypothesis, therefore, must be mistaken.
The argument depends on which one of the following assumptions?
Transit officials concluded that the city's new late-night bus routes have reduced drunk-driving arrests, since such arrests declined 15 percent in the six months after the routes were introduced.
The officials' conclusion depends on the assumption that
A public library waives late fines for patrons returning books during its annual amnesty week. Some board members object that this rewards irresponsibility. But the purpose of fines is to get books back into circulation, and amnesty week reliably prompts the return of hundreds of long-overdue books that fines alone had failed to recover. Therefore, the amnesty policy is justified.
Which one of the following principles, if established, would most help to justify the conclusion above?
If the bakery wanted to extend its hours into the evening, hiring a second shift of staff would be the only way it could do so. The bakery has just hired a second shift of staff. It is clear, therefore, that the bakery intends to extend its hours into the evening.
The reasoning in the argument is flawed because the argument