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And so you say MAYBE because you have not all the information required to make the final decision. e. to accept or reject a hypothesis, we then can put off the decision by saying MAYBE and seek the required information. 48 Yes, No or May be The form of the radar problem just discussed in which pulse packets are used is not without its weaknesses. If the decision is made that there is a signal when a packet has more than five l ' s and the first ten pulses contain seven l ' s , then the decision will be made that a signal is present independently of the remaining 90 pulses.

When deciding whether or not to insure your car against stealing you may draw on mathematical statistics. During the period of insurance the following two outcomes are possible: a)0 — the car has not been stolen, and (Ox—the car has been stolen. The two events can be considered random (at any rate from the point of view of the owner), and probabilities of any of the two outcomes can be estimated from the police statistics: P (to0) = p is the probability t h a t your car will not be stolen during the year, and P (ojj) == q = 1 — p is the probability t h a t your car will be stolen during the same period.

But the electrons are legion, and during a second about 1016 electrons come to the anode, and so the probability here does not appear to be so small. The situation with accidents in a town is about the same. Although the p r o b a b i l i t y for you personally to get involved in an accident is small, the population being large, the probability of at least one or even several accidents will be not at all small, and sometimes even close to unity, and so we often witness ambulance cars tearing along the streets.

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