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

1. 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??
2. 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??
3. can u tell me how to find the significance level......for example Jan 03 Q2 pls. thx
4. Just add up the two nearest probabilities...Well guys answers to the above??
5. 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
6. What about the first part of my question guys any answers??
7. (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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