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Assume that the number of Telephone calls arriving in an office during a 15minute period has a Poisson distribution with mean number of calls equal 5. By using a Poisson Distribution Formula, find the Probability that during a 15minute period, there will be exactly 3 calls.
The owner of a local golf course wanted to determine the average age of the golfers that played on the course. In a random sample of 30 golfers that visited his course, the sample mean was 48.34 and the standard deviation was 9.327. Calculate a 90..
Sketch a histogram of these data and give the modal class.
If a student guesses on each question, what is the probability that the student will pass the test?
Determine the mean number of times the machine was used per day.
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
A consumer group conducts crash test of new model cars. to determine the severity of damage to 2006 mazda 6s resulting from 10-mph crash into a concrete wall, the research group tests six cars of this type and assesses the amount of damage. descri..
Testing for Population mean - Can the difference in average educational level between the sample and the nation be explained by chance variation?
Give the 90% confidence interval for the mean score in the population of all young women.
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation for the number of hours of television watched per day is 1.6 and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a..
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
Using Area of Residence (Area A or Area B) as my stratification factor, explain, in detail, how you would select a sample of 60 inhabitants by using stratified random sampling.
For the following, describe the target population, sampling frame, sampling unit and observation unit. Is there any selection bias or inaccuracy of responses?
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