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Assume the accidents occur at random according to a Poisson process a rate of one every two days.
a) What is the probability that exactly two accidents will occur in a particular two-day interval?
b)What is the probability that one will have to wait at least two days to observe the next two accidents.
A cellular phone company advertises that the average age of its customers is lower than 30 years. It is known that the customer ages follow a normal distribution. A random sample of 16 of this company's customers responded as follows, when asked..
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
Store used ANOVA to test if mean sales for each credit card were equal. What are the degrees of freedom for F statistic?
two random variables x and y have the joint distribution p0 0 0.2 p0 2 0.3 p1 1 0.1 p2 0 0.3 p 2 2 0.1 and px y 0
If probability the first truck is available is= .75, probability the second truck is available is= .50, and probability both are available is= .30, determine the probability which neither truck is available?
undergrad students in a section of stat 225 are classified as lower classmen freshman and sophomores and upper classmen
a particular telephone number is used to receive both voice calls and fax messages. suppose that 20 of the incoming
Suppose you always reject the null hypothesis, regardless of any sample evidence.
eleven patients were weighed before and after a diet which was designed to help patients reduce weight. eight of these
The data presented in the table below resulted from an experiment in which seeds of 5 different types were planted and the number of seeds that germinated within 5 weeks after planting was recorded for each seed type.
Researcher asked group of 30 students - 12 of them supported change, 13 of them didn't, and 5 had no opinion. This is not binomial model as?
A survey of middle-aged men reveals that 28% of them are balding at the crown of their heads. Moreover, it is known that 18% of all middle-aged men who have this balding pattern will suffer a heart attack in the next 10 years.
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