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Otherwise the intensity parameter (accident rate) would not be constant over the entire time period. If the three assumptions hold, then the probability that there are accidents during a time interval of length will be given by (1), where is the average of expected number of accidents per unit time. Example 26.2 During the busy period from 4:00 to 6:00pm on weekdays, accidents occur along a stretch of highway at the average rate of 3 per hour. What is the probability that there will be more than 6 accidents in a 1-hour period? What is the probability that there will be at most 2 accidents during the 2-hour busy period on a particular day?
Tthe population standard deviation is not equal to 8 at the 0.05 level of significance. Calculate the value of the test statistic.
Last school year, student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classificati..
The lifetime of automobile tires of a certain brand are found to follow an exponential distribution with mean 30 (in thousands of miles). Find the probability that one of these tires will last
15% were contaminated with salmonella, and 13% were contaminated with both of these bacteria. What is the probability that a tested chicken chosen at random is: contaminated with salmonella and not campylobacter.
In an early study, researchers at an Ivy University found that 33% of the freshmen had received at least one A in their first semester.
Explain why one would expect to find a positive correlation between the number of fire engines that respond to a fire and the amount of damage done in the fire. Does this mean that the damage would be less extensive if fewer fire engines were disp..
You're responsible for planning parking needed for a new 256-unit apartment complex, and you're told to base the needs on the statistic 'average number of vehicles per household is 1.9'.
"Give an example of a statistic that you have heard quoted in the media that you do not believe is accurate either due to bias or other incorrect statistical methods. Describe the relevant population and the source (e.g. newspaper, TV, radio, inte..
Given that he makes first, assume probability that he makes second is 0.60. Given that he misses first, assume probability that he makes second one is 0.40.
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
For given population of high school seniors, the schoolastic aptitude test (SAT) in mathemathics has mean score of 500 with the standard deviation of 100.
The Complaints Department of a popular used car dealer receives most complaints about the electrical system, particularly the starter.
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