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The number of traffic accidents on successive days are independent Poisson random variable with mean 2.
a) Find the probability that 3 of the next 5 days have no accidents.
b) Find the probability that there are a toal of 6 accidents over the next 2 days.
c) If each accident is independently a "major accident" with probability p, what is the probability that there are no major accidents tomorrow?
State the quick rule for a significant correlation and explain its limitations. What sums are needed to calculate a correlation coefficient? What are the two ways of testing a correlation coefficient for significance?
assuming that both population s are normally distributed construct a 95 confidence interval about micro1 - micro2 .
using data collected from the fbi the number of registered automatic weapons and the murder rate were obtained for
questionthe following data represents the car tyres life time in days for three different companies in indiacompany
A researcher wishes to estimate with 95% confidence, the proportion of adults who have high speed internet. Her estimate must be accurate within 2% of the true proportion. a) Find the minimum sample size needed using the previous study that sh..
question suppose a test for a certain disease is given to mike. the probability of a positive test result is .98 if
From experience he knows that he can go another 15 miles. What is the probability that he will be stranded on the highway without gasoline?
question past records show that the mean life of a certain brand of batteries used in a digital clock is 305 days.
When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
According to the Insurance Institute of America, a family of four spends between $400 and $3800 per year on all types of insurance. Suppose the money spent is uniformly distributed between these amounts.
Average performance evaluation is higher for managers hired from outside firm compared with those promoted from within? What other stories does this graph tell?
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