Poisson Approximation to Binomial

In summary, for a binomial distribution with n=10 and p=0.5, it is not recommended to use the Poisson approximation due to not satisfying the conditions of n>=100 and np<=10. However, if one chooses to still use the Poisson approximation, the resulting probabilities may not be acceptable as approximations. This is because the Poisson formula gives a probability of 3.4%, while the binomial formula gives a probability of 1%, and using the mean+/- 2(standard deviation) gives a range of 8.4% to 1.8%. This discrepancy may be confusing because the binomial formula should give an answer within the maximum and minimum usual values.
  • #1
Victor Frankenstein
29
0
For a binomial distribution with n=10 and p=0.5 ,we should not use the poisson approximation because both of the conditions n>=100 and np<=10 are not satisfied. SUppose we go way out on a limb and use the Poisson aproximation anyway. Are the resulting probabilities unacceptable approximations? Why or why not ?
 
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  • #2
Have you worked out the actual value and the approximation?
 
  • #3
n=10, p=1/2, x=1, mean=n*p= 5

using the poisson formula i got 3.4%
using binomial formula I got 1%
using (mean)+/- 2(standard deviation) i got 8.4 - 1.8

I don't know If its right, confused because should'nt the binomial furmula give the answer within the maximum and minumum usual values ?
 

FAQ: Poisson Approximation to Binomial

What is the "Poisson Approximation to Binomial"?

The Poisson Approximation to Binomial is a statistical method used to approximate the binomial distribution when the number of trials is large and the probability of success is small. It allows for easier calculation and interpretation of data.

When should the Poisson Approximation to Binomial be used?

The Poisson Approximation to Binomial should be used when the number of trials is at least 20 and the probability of success is less than or equal to 0.05. This is known as the rule of rare events.

What are the assumptions of the Poisson Approximation to Binomial?

The assumptions of the Poisson Approximation to Binomial include a fixed number of trials, independent trials, and a constant probability of success for each trial. It also assumes that the events are rare, meaning the probability of success is small.

What are the benefits of using the Poisson Approximation to Binomial?

One of the main benefits of using the Poisson Approximation to Binomial is that it simplifies the calculation and interpretation of data. It also allows for easier visualization and comparison of data. Additionally, it can be used for large sample sizes without the need for complex calculations.

Are there any limitations to the Poisson Approximation to Binomial?

Yes, the Poisson Approximation to Binomial is only accurate when the number of trials is large and the probability of success is small. If these conditions are not met, the approximation may not be accurate. It also assumes that the events are independent and occur at random, which may not always be the case in real-world scenarios.

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