please read this message carefully

[Pramod Gupta]

Fitting of Data in a Binomial Distribution:

 

Guys,

While teaching the fitting into Binomial Distribution I made a mistake. Suppose a varible x takes 5 value 0, 1, 2, 3 and 4 and the frequency distribution consists of say 25 observations. While fitting the data into Binomial the paramter "n" of the Bin (n,p) distribution will be 5 not 25. In class I used 25 which is the total frequency N to construct the probability distribution.

 

The correction is that you have to use N=25 to find out the mean of the frequncy distribution using the standard formula for weighted arithmatic mean. But you have to use n=5 to find out the probability of succes p in each trial. Subsequently while fitting the data to construct probability distribution (in this case Binomial Distribution) you must use n=5 as the parameter, i.e., the number of values the variable x can take. 

Caution: This correction is only for Binomial Distribution. For Poisson just follow what I have taught in the class....

 

Good Luck...Dont get nervous, you all will do fine in the exam...

 

best,

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