The Student Room Group

This discussion is now closed.

Check out other Related discussions

S2 - Suitable model of distribution?

Sue throws a fair coin 15 times and records the number of times it shows heads. State the distribution to model the number of times the coin shows a head.

as n=15 and p=0.5 i said normal, but the mark scheme says binomial.
surely a coin toss has a normal distribution? or is the answer to these types of question always binomial distribution?
jbuck100
Sue throws a fair coin 15 times and records the number of times it shows heads. State the distribution to model the number of times the coin shows a head.

as n=15 and p=0.5 i said normal, but the mark scheme says binomial.
surely a coin toss has a normal distribution? or is the answer to these types of question always binomial distribution?


its binomial.
for coin flips its usually always binomial; as it has only 2 outcomes and fits the criteria better.
It's a discrete random variable with a uniform rate of occurance, so ofcourse it's binomial - normal is for continous variables.
Reply 3
Avatar for jbuck100
jbuck100
OP
1
cool, although isnt poisson also a discrete random variable with a uniform rate of occurance?
i assume the answer would never be poisson though unless they ask like 'what would be a suitable approximation to use'..
Reply 4
Avatar for khaggy
khaggy
jbuck100
cool, although isnt poisson also a discrete random variable with a uniform rate of occurance?
i assume the answer would never be poisson though unless they ask like 'what would be a suitable approximation to use'..


It cannot be poisson as it has to satisfy that n is large and p is small
jbuck100
cool, although isnt poisson also a discrete random variable with a uniform rate of occurance?
i assume the answer would never be poisson though unless they ask like 'what would be a suitable approximation to use'..

It can't be poisson as the variance and mean will be far away from eachother.
Reply 6
Avatar for jbuck100
jbuck100
OP
1
awesome

Related discussions

Latest

Trending

Trending

Articles for you