Question #140635
Qnb.The number of snakes found in each of 100 sampling quadrats in an area were as follows:
Number of snakes, S 0 1 2 3 4 5 8 15
f = frequency of S 69 18 7 2 1 1 1 1
REQUIRED
Find the mean and variance of the number of snakes per sampling unit.
Determine whether or not the data fit the Poisson distribution. (4 Marks)
Number of snakes, S 0 1 2 3 4 5 8 15
f = frequency of S 69 18 7 2 1 1 1 1
REQUIRED
Find the mean and variance of the number of snakes per sampling unit.
Determine whether or not the data fit the Poisson distribution. (4 Marks)
Expert's answer
mean=(69*0+18*1+7*2+2*3+1*4+1*5+1*8+1*15)/100=0.7
sd=1.86677
variance=sd2=3.48
mean is not equal to its variance - this is not Poisson distribution
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, 5 examples of this chromosome are examined from each of 120 patients, the number of affected one, r, being recorded for each patient. The results are tabulated below; r 0 1 2 3 4 5 f = frequency 6 31 42 29 10 2 Estimate the proportion p of affected chromosomes and hence compute their variance