S2 Edexcel-What way is best for hypothesis testing??

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2Pacalypse
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For example Jan 2002 S2 paper Question 2. Would it be better to find the critical region for hypo to be true(which is X>=16) or the way I do it which is to find null hypo and H1 use the X follows Poisson 10 bit cos of the 4 weeks and then proceed

P(X>=14)= 1-P(X<=13)=

1-0.8645=0.1355 which is greater than the 5percent level so there is insufficient evidence to reject H null in favour of H1??? Both ways give a correct solution.

And also when you rewrite PDFs--->CDFs I always get the inequality signs muddled in a sense they are right but I miss a "less than or equal to" sign or "greater than or equal" and just leave it as "greater than." Is this penalised in the exam??
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2Pacalypse
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Also Q4 Jun 2003 I have used a rectangular thingy from -5 to 9 which I feel is correct yet they use 0 to 14. I still get the same for d as the answer but why can't it be used as my way??
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babylon
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can u tell me how to find the significance level......for example Jan 03 Q2 pls. thx
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2Pacalypse
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Just add up the two nearest probabilities...Well guys answers to the above??
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zxcvbnm
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it doesnt matter what values u use as long as they represent the same interval but if u read the question it says " x represents the time AFTER 7:55 when the bus arrives " so time is 0 at 7:55
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2Pacalypse
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What about the first part of my question guys any answers??
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kimoni
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(Original post by 2Pacalypse)
For example Jan 2002 S2 paper Question 2. Would it be better to find the critical region for hypo to be true(which is X>=16) or the way I do it which is to find null hypo and H1 use the X follows Poisson 10 bit cos of the 4 weeks and then proceed
here's how I did it.

H0: λ=2.5
H1: λ>2.5

Let X be the random variable "the number of houses sold in 4 weeks"
X~Po(10)
P(X>=14) = 1 - P(X<=13)
from tables: 1-0.8645 = 0.1355
which is greater than 0.05, and thus is not significant
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