What distribution is better in these situations?

[nhansolo]

I'm new in statistics and probability and I'm a little lost about what distribution is better in these situations:

• If a tumor is malignant or not --> Bernouilli
• Number of entries in an emergency service during a night, know that on average 20 entries are observed per night. --> Poisson
• Tumor size after extraction--> ????
• Number of patients with a malignant tumor in groups of 15 patients-> ????

Thanks in advance!!

 

[hlsmith]

I agree with the first two. The second may be approximate normal with average and sample size gets larger.


Third seems to too vague, if it is random sample of sizes - normal distribution


Fourth - Binomial?

 

[nhansolo]

Why Binomial the 4th?

 

[hlsmith]

Because I am stat stupid.Series of Bernoulli trials. That and it had not been used yet. I could easily be wrong though.


You get what you pay for here.