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Aeroplanes arrive at Chicago's O'Hare airport at the average rate of 5.5 per minute. Air traffic controllers can safely handle a maximum of seven planes per minute. What is the probability that airport safety is jeopardised? Planes arrive randomly and independently.
Must the company replace old truck? If so which of new trunks must they use? Describe in detail.
If you suppose returns follow normal distribution, which investment would give better chance of getting at least a $40MIL return and describe why.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
Students in the social work course received the following course grades. Create a frequency distribution for this data. Compute the mean. Determine the median.
What is the average monthly amount charge? What percent of monthly charges are between $600 and $ $889 What percent of monthly charges is less than $100.
Assign probabilities to the sample points and then find the probability that the first envelope purchased contains less than $100.
Use an alpha level of .01 and test the hypothesis that the two methods are producing the same mean.
How many dissimilar computer passwords are possible?
Using the probabilities above what is the expected size of family you draw?
q1. suppose you estimate a model obtaining wage 0.620 0.506 times educ 2.27 times female were wage is measured in
Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.
A simple random sample is to be drawn from a population of 1200. To have 90% confidence that the sampling error in estimating p is no more than 0.03
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