Stat 160 Prequiz over Section 4.4, 4.5, and 4.6



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1. Bernoulli trials are

a collection of techniques used to try criminals during the French revolution.
trials which end in either success or failure.
ways of generating a Poisson distribution.
none of the above.
2. Which of the following is not true of the binomial distrubution?

Trials end in either success or failure.
Trials are independent of each other.
The probability of success remains constant.
The binomial distribution is always symmetric
3.A coin flip is an example of a binomial distribution. Let X = the number of times we get heads. If I flip an unfair coin 10 times (n=10) and the probability of heads is .4 (p=.4), what is the expected number of heads (mu)?

10
40
4
.04
4. The Poisson probability distribution is

a way of telling queues from lines.
the French version of the binomial probability model.
only applicable when waiting in line.
a distribution of the number of events over time.